Take a cue from the CONTRIBUTION policy of libuv.

https://github.com/joyent/libuv/blob/master/CONTRIBUTING.md

CONTRIBUTING.md

@@ -44,5 +44,18 @@ would related to existing features.
 We **love** pull requests and if a contribution is significant we tend to offer
 push access.
 
-All contributions will be licenced under the MIT license.
-
+All contributions _will_ be licenced under the MIT license.
+
+Code/comments should adhere to the following rules:
+
+* Names should be descriptive and concise.
+* Use two spaces and no tabs.
+* When documenting APIs and/or source code, don't make assumptions or make
+  implications about race, gender, religion, political orientation or anything
+  else that isn't relevant to the project.
+* When writing comments, use properly constructed sentences, including
+  punctuation.
+* Remember that source code usually gets written once and read often: ensure
+  the reader doesn't have to make guesses. Make sure that the purpose and inner
+  logic are either obvious to a reasonably skilled professional, or add a
+  comment that explains it.