php error on line 93 of moduleinfo.module

I enable and get:
"Missing argument 1 for arg(), called in .../sites/all/modules/moduleinfo/moduleinfo.module on line 93 and defined in .../includes/path.inc on line 148."

Line 93 code before: $res = module_invoke($module,"help","admin/help#".$module,arg());
I changed it to: $res = module_invoke($module,"help","admin/help#$module");

The error goes away, and the link to admin help displays correctly (I think).

Is this right?
Thanks