#12761: fix wording of zlib license section

diff --git a/Doc/license.rst b/Doc/license.rst
index d029f0fb49b2b12f2c7fb10a78dc3369628ec4f8..8693a0fb5785fc0fd626339a7cf9b9e504b5f3ec 100644 (file)
--- a/Doc/license.rst
+++ b/Doc/license.rst
@@ -881,7 +881,7 @@ zlib
 ----
 
 The :mod:`zlib` extension is built using an included copy of the zlib
-sources unless the zlib version found on the system is too old to be
+sources if the zlib version found on the system is too old to be
 used for the build::
 
   Copyright (C) 1995-2011 Jean-loup Gailly and Mark Adler