diff -r 40174a95a2bf -r bf1d88d8881b Doc/library/zlib.rst
--- a/Doc/library/zlib.rst	Mon Jun 13 20:29:11 2011 +0200
+++ b/Doc/library/zlib.rst	Mon Jun 13 20:49:07 2011 +0200
@@ -220,6 +220,15 @@
    .. versionadded:: 3.3
 
 
+.. data:: ZLIB_VERSION
+
+   The version string of the zlib library that was used for building the module.
+   This may be different from the zlib library actually used at runtime, which
+   is available as :const:`ZLIB_RUNTIME_VERSION`.
+
+   .. versionadded:: 1.5
+
+
 .. seealso::
 
    Module :mod:`gzip`