ENH: better docs

Source/cmFindFileCommand.h

@@ -74,7 +74,9 @@ public:
       "Find a file in the system PATH or in any extra paths specified in the command."
       "A cache entry called NAME is created to store the result.   NOTFOUND is the value"
       " used if the file was not found.  If DOC is specified the next argument is the "
-      "documentation string for the cache entry NAME.";
+      "documentation string for the cache entry NAME.  Since Executables, "
+      "can have different extensions on different platforms, FIND_PROGRAM,"
+      " should be used instead of FIND_FILE when looking for and executable.";
     }
   
   cmTypeMacro(cmFindFileCommand, cmCommand);