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+API stability
+=============
+
+From its first release, ``cryptography`` will have a strong API stability
+policy.
+
+What does this policy cover?
+----------------------------
+
+This policy includes any API or behavior that is documented in this
+documentation.
+
+What does "stable" mean?
+------------------------
+
+* Public APIs will not be removed or renamed without providing a compatibility
+  alias.
+* The behavior of existing APIs will not change.
+
+What doesn't this policy cover?
+-------------------------------
+
+* We may add new features, things like the result of ``dir(obj))`` or the
+  contents of ``obj.__dict__`` may change.
+* Objects are not guaranteed 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
+~~~~~~~~
+
+One exception to our API stability policy is for security. We will violate this
+policy as necessary in order to resolve a security issue or harden
+``cryptography`` against a possible attack.
+
+Versioning
+----------
+
+This project uses a custom versioning scheme as described below.
+
+Given a version ``cryptography X.Y.Z``,
+
+* ``X.Y`` is a decimal number that is incremented for
+  potentially-backwards-incompatible releases.
+
+  * This increases like a standard decimal.
+    In other words, 0.9 is the ninth release, and 1.0 is the tenth (not 0.10).
+    The dividing decimal point can effectively be ignored.
+
+* ``Z`` is an integer that is incremented for backward-compatible releases.
+
+Deprecation
+~~~~~~~~~~~
+
+From time to time we will want to change the behavior of an API or remove it
+entirely. In that case, here's how the process will work:
+
+* In ``cryptography X.Y`` the feature exists.
+* In ``cryptography X.Y + 0.1`` using that feature will emit a
+  ``UserWarning``.
+* In ``cryptography X.Y + 0.2`` using that feature will emit a
+  ``UserWarning``.
+* In ``cryptography X.Y + 0.3`` the feature will be removed or changed.
+
+In short, code that runs without warnings will always continue to work for a
+period of two releases.
+
+From time to time, we may decide to deprecate an API that is particularly
+widely used. In these cases, we may decide to provide an extended deprecation
+period, at our discretion.