[Bf-blender-cvs] [9951bb46e44] temp-vert-normals-cleanup: Cleanup: Improve comment

[Hans Goudey]

Commit: 9951bb46e441680fa53fe717f2ba3fafebd3e8f8
Author: Hans Goudey
Date:   Thu Jan 13 12:30:39 2022 -0600
Branches: temp-vert-normals-cleanup
https://developer.blender.org/rB9951bb46e441680fa53fe717f2ba3fafebd3e8f8

Cleanup: Improve comment

===================================================================

M	source/blender/blenkernel/BKE_mesh.h

===================================================================

diff --git a/source/blender/blenkernel/BKE_mesh.h b/source/blender/blenkernel/BKE_mesh.h
index 1ba3d0c0b47..a9a78bbc12e 100644
--- a/source/blender/blenkernel/BKE_mesh.h
+++ b/source/blender/blenkernel/BKE_mesh.h
@@ -397,6 +397,8 @@ void BKE_mesh_normals_tag_dirty(struct Mesh *mesh);
 
 /**
  * Check that a mesh with non-dirty normals has vertex and face custom data layers.
+ * If these asserts fail, it means some area cleared the dirty flag but didn't copy or add the
+ * normal layers, or removed normals but didn't set the dirty flag.
  */
 void BKE_mesh_assert_normals_dirty_or_calculated(const struct Mesh *mesh);