diff --git a/pep-3108.txt b/pep-3108.txt
index ef62c9688..036c74dd6 100644
--- a/pep-3108.txt
+++ b/pep-3108.txt
@@ -462,7 +462,7 @@ small audience or lack of adherence to more modern standards.
   + Undocumented.
   + Never updated to support absolute imports.
 
-* mutex
+* mutex [done: 2.6, 3.0]
 
   + Easy to implement using a semaphore and a queue.
   + Cannot block on a lock attempt.