extdiff: drop the command alias without options example in the help text In the dropped example, the extension would look for 'vdiff.diffargs' in the configuration, and not finding it, would run kdiff3 without the configured options. That's not obvious to a new user who sees a kdiff3 configuration in the prepackaged mergetools.rc file, and sees that kdiff3 still runs. While it is conceivable that the user wants a kdiff3 command that runs without the preconfigured options, it is more likely what they want is this, which uses the canned options: [alias] vdiff = kdiff3 [extdiff] kdiff3 = We could mention alias here, but that seems like it belongs elswhere.