[wp-hackers] giving original plugin author credit when altering code

[Scott Plumlee]

Is there a de facto/approved/agreed upon/'hey, that works!' method for 
giving an original plugin author credit when extending his/her plugin?

I've got a couple of plugins that I love to use, but I sometimes make a 
couple of changes to them to tweak them exactly as I want.  I don't know 
if I should create a new plugin based off the original and give credit 
somehow, or just patch the plugin whenever a new version from the 
original author comes out.

Any preferences from plugin authors on the list? I've read this: 
http://codex.wordpress.org/Writing_a_Plugin#Plugin_File_Structure, so 
I'm wondering if adding some sort of 'Original Plugin Name' line to give 
the correct credit.