make plural s lowercase
diff --git a/Doc/library/xmlrpc.client.rst b/Doc/library/xmlrpc.client.rst
index 6471ba2..d6360df 100644
--- a/Doc/library/xmlrpc.client.rst
+++ b/Doc/library/xmlrpc.client.rst
@@ -29,7 +29,7 @@
 
 .. warning::
 
-   In the case of https URIS, :mod:`xmlrpc.client` does not do any verification
+   In the case of https URIs, :mod:`xmlrpc.client` does not do any verification
    of the server's certificate.