1 files changed, 9 insertions, 0 deletions
diff --git a/source/blender/makesrna/intern/rna_brush.c b/source/blender/makesrna/intern/rna_brush.c
index 989b0654104..2aa0a1bba01 100644
--- a/source/blender/makesrna/intern/rna_brush.c
+++ b/source/blender/makesrna/intern/rna_brush.c
@@ -1654,6 +1654,15 @@ static void rna_def_gpencil_options(BlenderRNA *brna)
   RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
   RNA_def_property_update(prop, NC_GPENCIL | ND_DATA, NULL);
 
+  /* Factor to determine outline external perimeter thickness. */
+  prop = RNA_def_property(srna, "outline_thickness_factor", PROP_FLOAT, PROP_FACTOR);
+  RNA_def_property_float_sdna(prop, NULL, "outline_fac");
+  RNA_def_property_range(prop, 0.0f, 1.0f);
+  RNA_def_property_float_default(prop, 0.0f);
+  RNA_def_property_ui_text(
+      prop, "Thickness", "Thickness of the outline stroke relative to current brush thickness");
+  RNA_def_parameter_clear_flags(prop, PROP_ANIMATABLE, 0);
+
   /* Flags */
   prop = RNA_def_property(srna, "use_pressure", PROP_BOOLEAN, PROP_NONE);
   RNA_def_property_boolean_sdna(prop, NULL, "flag", GP_BRUSH_USE_PRESSURE);