diff --git a/Doc/using/cmdline.rst b/Doc/using/cmdline.rst
index fed83dfcc42..29d249f00fb 100644
--- a/Doc/using/cmdline.rst
+++ b/Doc/using/cmdline.rst
@@ -512,7 +512,7 @@ These environment variables influence Python's behavior.
 .. envvar:: PYTHONCASEOK
 
    If this is set, Python ignores case in :keyword:`import` statements.  This
-   only works on Windows.
+   only works on Windows, OS X, OS/2, and RiscOS.
 
 
 .. envvar:: PYTHONDONTWRITEBYTECODE
diff --git a/Misc/NEWS b/Misc/NEWS
index 5613ea52c55..188a09d3061 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -498,6 +498,8 @@ Tests
 Documentation
 -------------
 
+- Issue #13883: PYTHONCASEOK also works on OS X, OS/2, and RiscOS.
+
 - Issue #2134: The tokenize documentation has been clarified to explain why
   all operator and delimiter tokens are treated as token.OP tokens.