one file per commit

README.md

@@ -3,6 +3,9 @@
 That's what we're trying to build. Please contribute
 by [forking][fk] and sending a [pull request][pr].
 
+Also **please** only modify **one file** per commit. This'll
+make merging easier for everyone.
+
 Here's a good **global** gitignore: <http://help.github.com/git-ignore/>
 
 For more information on gitignore: [gitignore(5)][g5]