diff --git a/src/Mod/Fem/femmesh/meshtools.py b/src/Mod/Fem/femmesh/meshtools.py
index 6a3de70875e9..c0b2d7275263 100644
--- a/src/Mod/Fem/femmesh/meshtools.py
+++ b/src/Mod/Fem/femmesh/meshtools.py
@@ -1621,6 +1621,9 @@ def get_pressure_obj_faces(
                     # 0 if femmeshface normal == reference face normal direction
                     # -1 if femmeshface normal opposite reference face normal direction
                     # easy on plane faces, but on a half sphere ... ?!?
+                    # might be useful to add ...
+                    # How to find the orientation of a FEM mesh face?
+                    # https://forum.freecadweb.org/viewtopic.php?f=18&t=51898
         else:
             FreeCAD.Console.PrintError(
                 "Pressure on shell mesh at the moment only "