diff --git a/Source/cmDependsFortranParser.y b/Source/cmDependsFortranParser.y
index c6f569784e..c433c769f4 100644
--- a/Source/cmDependsFortranParser.y
+++ b/Source/cmDependsFortranParser.y
@@ -34,6 +34,7 @@ Run bison like this:
   bison --yacc --name-prefix=cmDependsFortran_yy --defines=cmDependsFortranParserTokens.h -ocmDependsFortranParser.c cmDependsFortranParser.y
 
 Modify cmDependsFortranParser.c:
+  - remove TABs
   - remove the yyerrorlab label and associated code
 
 */