diff --git a/Doc/using/cmdline.rst b/Doc/using/cmdline.rst
index 9274d8e6b3f..c386fb41ee0 100644
--- a/Doc/using/cmdline.rst
+++ b/Doc/using/cmdline.rst
@@ -448,7 +448,7 @@ 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, and OS/2.
 
 
 .. envvar:: PYTHONDONTWRITEBYTECODE
diff --git a/Misc/NEWS b/Misc/NEWS
index 5e2c47ee044..ba60758780f 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -432,6 +432,8 @@ Extension Modules
 Documentation
 -------------
 
+- Issue #13883: PYTHONCASEOK also used on OS X and OS/2.
+
 - Issue #12949: Document the kwonlyargcount argument for the PyCode_New
   C API function.