Note abotu development versions
diff --git a/docs/api-stability.rst b/docs/api-stability.rst
index 6497a68..40608ac 100644
--- a/docs/api-stability.rst
+++ b/docs/api-stability.rst
@@ -24,6 +24,8 @@
contents of ``obj.__dict__`` may change.
* Objects are not guarnteed to be pickleable, and pickled objects from one
version of ``cryptography`` may not be loadable in future versions.
+* Development versions of ``cryptography``. Before a feature is in a release,
+ it is not covered by this policy and may change.
Security
~~~~~~~~