diff --git a/Misc/NEWS b/Misc/NEWS
index f051d20319f..cff31404293 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -419,6 +419,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #12798: Updated the mimetypes documentation.
+
 - Issue #13626: Add support for SSL Diffie-Hellman key exchange, through the
   SSLContext.load_dh_params() method and the ssl.OP_SINGLE_DH_USE option.