diff --git a/src/Mod/Arch/ArchBuildingPart.py b/src/Mod/Arch/ArchBuildingPart.py
index c6bffe8140..6344fba2bf 100644
--- a/src/Mod/Arch/ArchBuildingPart.py
+++ b/src/Mod/Arch/ArchBuildingPart.py
@@ -332,7 +332,7 @@ class BuildingPart(ArchIFC.IfcProduct):
         if not "Height" in pl:
             obj.addProperty("App::PropertyLength","Height","BuildingPart",QT_TRANSLATE_NOOP("App::Property","The height of this object"))
         if not "HeightPropagate" in pl:
-            obj.addProperty("App::PropertyBool","HeightPropagate","Children",QT_TRANSLATE_NOOP("App::Property","If true, the height value propagates to contained objects"))
+            obj.addProperty("App::PropertyBool","HeightPropagate","Children",QT_TRANSLATE_NOOP("App::Property","If true, the height value propagates to contained objects if the height of those objects is set to 0"))
             obj.HeightPropagate = True
         if not "LevelOffset" in pl:
             obj.addProperty("App::PropertyLength","LevelOffset","BuildingPart",QT_TRANSLATE_NOOP("App::Property","The level of the (0,0,0) point of this level"))