diff --git a/src/SMESH_SWIG/smeshBuilder.py b/src/SMESH_SWIG/smeshBuilder.py
index e5e8b9f07..fb95c5b50 100644
--- a/src/SMESH_SWIG/smeshBuilder.py
+++ b/src/SMESH_SWIG/smeshBuilder.py
@@ -552,7 +552,7 @@ class smeshBuilder(object, SMESH._objref_SMESH_Gen):
         return aMeshes, aStatus
 
     ## Creates a Mesh object importing data from the given GMF file.
-    #  GMF files have .mesh extension for the ASCII format and .meshb for
+    #  GMF files must have .mesh extension for the ASCII format and .meshb for
     #  the bynary format.
     #  @return [ an instance of Mesh class, SMESH.ComputeError ]
     #  @ingroup l2_impexp