Add note on compatibility
[ci skip]
diff --git a/README.md b/README.md
index fc12bc4..506a1c0 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,13 @@
* Set operations (intersect, union)
* and [more](http://linkedin.github.com/datafu/docs/javadoc/)...
-Each function is unit tested and code coverage is being tracked for the entire library. It has been tested against Pig 0.11.
+Each function is unit tested and code coverage is being tracked for the entire library.
+
+## Pig Compatibility
+
+The current version of DataFu has been tested against Pig 0.11.1. DataFu should be compatible with some older versions of Pig, however
+we do not do any sort of testing with prior versions of Pig and do not guarantee compatibility.
+Our policy is to test against the most recent version of Pig whenever we release and make sure DataFu works with that version.
## Blog Posts
