diff --git a/docs/installation.rst b/docs/installation.rst
index 16c42d2..a98501f 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -21,6 +21,10 @@
 * x86-64 Debian Wheezy (7.x), Jessie (8.x), and Debian Sid (unstable)
 * 32-bit and 64-bit Python on 64-bit Windows Server 2012
 
+.. warning::
+    Python 2.6 is no longer supported by the Python core team. A future version
+    of cryptography will drop support for this version.
+
 We test compiling with ``clang`` as well as ``gcc`` and use the following
 OpenSSL releases:
 
@@ -33,6 +37,11 @@
 * ``OpenSSL 1.0.1f``
 * ``OpenSSL 1.0.2-latest``
 
+.. warning::
+    OpenSSL versions 0.9.8 and 1.0.0 are no longer supported by the OpenSSL
+    project. A future version of cryptography will drop support for these
+    releases.
+
 On Windows
 ----------