diff --git a/src/bonsai/bonsai/bim/module/pset/operator.py b/src/bonsai/bonsai/bim/module/pset/operator.py
index d29045d4b0..896d0e856c 100644
--- a/src/bonsai/bonsai/bim/module/pset/operator.py
+++ b/src/bonsai/bonsai/bim/module/pset/operator.py
@@ -447,6 +447,33 @@ class AddProposedProp(bpy.types.Operator):
     prop_name: bpy.props.StringProperty()
     prop_value: bpy.props.StringProperty()
 
+    @classmethod
+    def description(cls, context, properties):
+        description = "Add proposed property to the custom property set.\n\n"
+        props = tool.Pset.get_pset_props(properties.obj, properties.obj_type)
+        if props.active_pset_type == "PSET":
+            description += (
+                "Property type will be deduced from the provided value. Possible types:\n"
+                "- provide an integer or a float to create integer/real property\n"
+                "- 'true', 'false' to add a boolean property\n"
+                "- 'null' or '' (empty value) to add a null property\n"
+                "- any other value will be added as a string property"
+            )
+        else:
+            from ifcopenshell.api.pset.edit_qto import FLOAT_TYPE_KEYWORDS
+
+            description += (
+                "Property type will be deduced from the provided value and property name. Possible types:\n"
+                "- Integer values - Count type\n"
+                "- Float values - will try to match one of the keywords below in prop name, "
+                "otherwise will default to Length type\n\n"
+                "Types and their keywords:\n"
+            )
+            for prop_type, keywords in FLOAT_TYPE_KEYWORDS:
+                description += f"- {prop_type} - {', '.join(keywords)}\n"
+            description = description.rstrip()  # Strip last newline.
+        return description
+
     def execute(self, context):
         res = core.add_proposed_prop(tool.Pset, self.obj, self.obj_type, self.prop_name, self.prop_value)
         if res: