diff --git a/io_mesh_uv_layout/__init__.py b/io_mesh_uv_layout/__init__.py
index dc6c05d53e7411a21c17634c7a878eca3a6da25b..d467dcf543e10d0fe4322371d23aee0d2757396b 100644
--- a/io_mesh_uv_layout/__init__.py
+++ b/io_mesh_uv_layout/__init__.py
@@ -102,6 +102,7 @@ class ExportUVLayout(bpy.types.Operator):
             name="Fill Opacity",
             min=0.0, max=1.0,
             default=0.25,
+            description="Set amount of opacity for exported UV layout"
             )
     tessellated = BoolProperty(
             name="Tessellated UVs",