diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index ff3b0ef768..f747cbc971 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -6465,8 +6465,8 @@ ReadOnlySlicingStatesConfigDef::ReadOnlySlicingStatesConfigDef()
     ConfigOptionDef* def;
 
     def = this->add("zhop", coFloat);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Current z-hop");
+    def->tooltip = L("Contains z-hop present at the beginning of the custom G-code block.");
 }
 
 ReadWriteSlicingStatesConfigDef::ReadWriteSlicingStatesConfigDef()
@@ -6475,19 +6475,21 @@ ReadWriteSlicingStatesConfigDef::ReadWriteSlicingStatesConfigDef()
 
     def = this->add("position", coFloats);
     def->label = L("Position");
-    def->tooltip = L("");
+    def->tooltip = L("Position of the extruder at the beginning of the custom G-code block. If the custom G-code travels somewhere else, "
+                     "it should write to this variable so PrusaSlicer knows where it travels from when it gets control back.");
 
     def = this->add("e_retracted", coFloats);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Retraction");
+    def->tooltip = L("Retraction state at the beginning of the custom G-code block. If the custom G-code moves the extruder axis, "
+                     "it should write to this variable so PrusaSlicer deretracts correctly when it gets control back.");
 
     def = this->add("e_restart_extra", coFloats);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Extra deretraction");
+    def->tooltip = L("Currently planned extra extruder priming after deretraction.");
 
     def = this->add("e_position", coFloats);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Absolute E position");
+    def->tooltip = L("Current position of the extruder axis. Only used with absolute extruder addressing.");
 }
 
 OtherSlicingStatesConfigDef::OtherSlicingStatesConfigDef()
@@ -6496,35 +6498,35 @@ OtherSlicingStatesConfigDef::OtherSlicingStatesConfigDef()
 
     def = this->add("current_extruder", coInt);
     def->label = L("Current extruder");
-    def->tooltip = L("");
+    def->tooltip = L("Zero-based index of currently used extruder.");
 
     def = this->add("current_object_idx", coInt);
     def->label = L("Current object index");
-    def->tooltip = L("");
+    def->tooltip = L("Specific for sequential printing. Zero-based index of currently printed object.");
 
     def = this->add("has_single_extruder_multi_material_priming", coBool);
     def->label = L("Has single extruder MM priming");
-    def->tooltip = L("");
+    def->tooltip = L("Are the extra multi-material priming regions used in this print?");
 
     def = this->add("has_wipe_tower", coBool);
     def->label = L("Has wipe tower");
-    def->tooltip = L("");
+    def->tooltip = L("Whether or not wipe tower is being generated in the print.");
 
     def = this->add("initial_extruder", coInt);
     def->label = L("Initial extruder");
-    def->tooltip = L("");
+    def->tooltip = L("Zero-based index of the first extruder used in the print. Same as initial_tool.");
 
-    def = this->add("initial_filament_type", coStrings);
-    def->label = L("");
-    def->tooltip = L("");
+    def = this->add("initial_filament_type", coString);
+    def->label = L("Initial filament type");
+    def->tooltip = L("String containing filament type of the first used extruder.");
 
     def = this->add("initial_tool", coInt);
     def->label = L("Initial tool");
-    def->tooltip = L("");
+    def->tooltip = L("Zero-based index of the first extruder used in the print. Same as initial_extruder.");
 
     def = this->add("is_extruder_used", coBools);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Is extruder used?");
+    def->tooltip = L("Vector of bools stating whether a given extruder is used in the print.");
 }
 
 PrintStatisticsConfigDef::PrintStatisticsConfigDef()
@@ -6532,68 +6534,68 @@ PrintStatisticsConfigDef::PrintStatisticsConfigDef()
     ConfigOptionDef* def;
 
     def = this->add("extruded_volume", coFloats);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Volume per extruder");
+    def->tooltip = L("Total filament volume extruded per extruder during the entire print.");
 
     def = this->add("normal_print_time", coString);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Print time (normal mode)");
+    def->tooltip = L("Estimated print time when printed in normal mode (i.e. not in silent mode). Same as print_time.");
 
     def = this->add("num_printing_extruders", coInt);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Number of printing extruders");
+    def->tooltip = L("Number of extruders used during the print.");
 
     def = this->add("print_time", coString);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Print time (normal mode)");
+    def->tooltip = L("Estimated print time when printed in normal mode (i.e. not in silent mode). Same as normal_print_time.");
 
     def = this->add("printing_filament_types", coString);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Used filament types");
+    def->tooltip = L("Comma-separated list of all filament types used during the print.");
 
     def = this->add("silent_print_time", coString);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Print time (silent mode)");
+    def->tooltip = L("Estimated print time when printed in silent mode.");
 
     def = this->add("total_cost", coFloat);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Total cost");
+    def->tooltip = L("Total cost of all material used in the print. Calculated from filament_cost value in Filament Settings.");
 
     def = this->add("total_weight", coFloat);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Total weight");
+    def->tooltip = L("Total weight of the print. Calculated from filament_density value in Filament Settings.");
 
     def = this->add("total_wipe_tower_cost", coFloat);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Total wipe tower cost");
+    def->tooltip = L("Total cost of the material wasted on the wipe tower. Calculated from filament_cost value in Filament Settings.");
 
     def = this->add("total_wipe_tower_filament", coFloat);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Wipe tower volume");
+    def->tooltip = L("Total filament volume extruded on the wipe tower.");
 
     def = this->add("used_filament", coFloat);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Used filament");
+    def->tooltip = L("Total length of filament used in the print.");
 
     def = this->add("total_toolchanges", coInt);
     def->label = L("Total toolchanges");
-    def->tooltip = L("");
+    def->tooltip = L("Number of toolchanges during the print.");
 
     def = this->add("extruded_volume_total", coFloat);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Total volume");
+    def->tooltip = L("Total volume of filament used during the entire print.");
 
     def = this->add("extruded_weight", coFloats);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Weight per extruder");
+    def->tooltip = L("Weight per extruder extruded during the entire print. Calculated from filament_density value in Filament Settings.");
 
     def = this->add("extruded_weight_total", coFloat);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Total weight");
+    def->tooltip = L("Total weight of the print. Calculated from filament_density value in Filament Settings.");
 
     def = this->add("total_layer_count", coInt);
     def->label = L("Total layer count");
-    def->tooltip = L("");
+    def->tooltip = L("Number of layers in the entire print.");
 }
 
 ObjectsInfoConfigDef::ObjectsInfoConfigDef()
@@ -6601,90 +6603,87 @@ ObjectsInfoConfigDef::ObjectsInfoConfigDef()
     ConfigOptionDef* def;
 
     def = this->add("num_objects", coInt);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Number of objects");
+    def->tooltip = L("Total number of objects in the print.");
 
     def = this->add("num_instances", coInt);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Number of instances");
+    def->tooltip = L("Total number of object instances in the print, summed over all objects.");
 
     def = this->add("scale", coStrings);
-    def->label = L("");
-    def->tooltip = L("");
-
-    def = this->add("input_filename", coString);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Scale per object");
+    def->tooltip = L("Contains a string with the information about what scaling was applied to the individual objects. "
+                     "Indexing of the objects is zero-based (first object has index 0).\n"
+                     "Example: 'x:100% y:50% z:100'.");
 
     def = this->add("input_filename_base", coString);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Input filename without extension");
+    def->tooltip = L("Source filename of the first object, without extension.");
 }
 
 DimensionsConfigDef::DimensionsConfigDef()
 {
     ConfigOptionDef* def;
 
+    const std::string point_tooltip   = L("The vector has two elements: x and y coordinate of the point. Values in mm.");
+    const std::string bb_size_tooltip = L("The vector has two elements: x and y dimension of the bounding box. Values in mm.");
+
     def = this->add("first_layer_print_convex_hull", coPoints);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("First layer convex hull");
+    def->tooltip = L("Vector of points of the first layer convex hull. Each element has the following format:"
+                     "'[x, y]' (x and y are floating-point numbers in mm).");
 
     def = this->add("first_layer_print_min", coFloats);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Bottom-left corner of first layer bounding box");
+    def->tooltip = point_tooltip;
 
     def = this->add("first_layer_print_max", coFloats);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Top-right corner of first layer bounding box");
+    def->tooltip = point_tooltip;
 
     def = this->add("first_layer_print_size", coFloats);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Size of the first layer bounding box");
+    def->tooltip = bb_size_tooltip;
 
     def = this->add("print_bed_min", coFloats);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Bottom-left corner of print bed bounding box");
+    def->tooltip = point_tooltip;
 
     def = this->add("print_bed_max", coFloats);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Top-right corner of print bed bounding box");
+    def->tooltip = point_tooltip;
 
     def = this->add("print_bed_size", coFloats);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Size of the print bed bounding box");
+    def->tooltip = bb_size_tooltip;
 }
 
+
 TimestampsConfigDef::TimestampsConfigDef()
 {
     ConfigOptionDef* def;
 
     def = this->add("timestamp", coString);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Timestamp");
+    def->tooltip = L("String containing current time in yyyyMMdd-hhmmss format.");
 
     def = this->add("year", coInt);
     def->label = L("Year");
-    def->tooltip = L("");
 
     def = this->add("month", coInt);
     def->label = L("Month");
-    def->tooltip = L("");
 
     def = this->add("day", coInt);
     def->label = L("Day");
-    def->tooltip = L("");
 
     def = this->add("hour", coInt);
     def->label = L("Hour");
-    def->tooltip = L("");
 
     def = this->add("minute", coInt);
     def->label = L("Minute");
-    def->tooltip = L("");
 
     def = this->add("second", coInt);
     def->label = L("Second");
-    def->tooltip = L("");
 }
 
 OtherPresetsConfigDef::OtherPresetsConfigDef()
@@ -6692,24 +6691,25 @@ OtherPresetsConfigDef::OtherPresetsConfigDef()
     ConfigOptionDef* def;
 
     def = this->add("num_extruders", coInt);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Number of extruders");
+    def->tooltip = L("Total number of extruders, regardless of whether they are used in the current print.");
 
     def = this->add("print_preset", coString);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Print preset name");
+    def->tooltip = L("Name of the print preset used for slicing.");
 
     def = this->add("filament_preset", coString);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Filament preset name");
+    def->tooltip = L("Names of the filament presets used for slicing. The variable is a vector "
+                     "containing one name for each extruder.");
 
     def = this->add("printer_preset", coString);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Printer preset name");
+    def->tooltip = L("Name of the printer preset used for slicing.");
 
     def = this->add("physical_printer_preset", coString);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Physical printer name");
+    def->tooltip = L("Name of the physical printer used for slicing.");
 }
 
 
@@ -6734,32 +6734,32 @@ CustomGcodeSpecificConfigDef::CustomGcodeSpecificConfigDef()
     ConfigOptionDef* def;
 
     def = this->add("layer_num", coInt);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Layer number");
+    def->tooltip = L("Index of the current layer. One-based (i.e. first layer is number 1).");
 
     def = this->add("layer_z", coFloat);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Layer z");
+    def->tooltip = L("Height of the current layer above the print bed, measured to the top of the layer.");
 
     def = this->add("max_layer_z", coFloat);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Maximal layer z");
+    def->tooltip = L("Height of the last layer above the print bed.");
 
     def = this->add("filament_extruder_id", coInt);
     def->label = L("");
     def->tooltip = L("");
 
     def = this->add("previous_extruder", coInt);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Previous extruder");
+    def->tooltip = L("Index of the extruder that is being unloaded. The index is zero based (first extruder has index 0).");
 
     def = this->add("next_extruder", coInt);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Next extruder");
+    def->tooltip = L("Index of the extruder that is being loaded. The index is zero based (first extruder has index 0).");
 
     def = this->add("toolchange_z", coFloat);
-    def->label = L("");
-    def->tooltip = L("");
+    def->label = L("Toolchange z");
+    def->tooltip = L("Height above the print bed when the toolchange takes place. Usually the same as layer_z, but can be different.");
 
     // I'm not sure if next options are really needed