diff --git a/Doc/library/threading.rst b/Doc/library/threading.rst
index fd815ef..93ea4bd 100644
--- a/Doc/library/threading.rst
+++ b/Doc/library/threading.rst
@@ -488,6 +488,10 @@
 
       There is no return value.
 
+   .. method:: locked()
+      Return true if the lock is acquired.
+
+
 
 .. _rlock-objects: