diff --git a/Doc/library/urllib.request.rst b/Doc/library/urllib.request.rst
index 6b2b013..cc759a4 100644
--- a/Doc/library/urllib.request.rst
+++ b/Doc/library/urllib.request.rst
@@ -124,10 +124,10 @@
 .. function:: getproxies()
 
    This helper function returns a dictionary of scheme to proxy server URL
-   mappings. It scans the environment for variables named ``<scheme>_proxy``
-   for all operating systems first, and when it cannot find it, looks for proxy
-   information from Mac OSX System Configuration for Mac OS X and Windows
-   Systems Registry for Windows.
+   mappings. It scans the environment for variables named ``<scheme>_proxy``,
+   in a case insensitive approach, for all operating systems first, and when it
+   cannot find it, looks for proxy information from Mac OSX System
+   Configuration for Mac OS X and Windows Systems Registry for Windows.
 
 
 The following classes are provided: