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diff --git a/doc/reference.texi b/doc/reference.texi
index c44988c..3b28d3b 100644
--- a/doc/reference.texi
+++ b/doc/reference.texi
@@ -683,7 +683,7 @@ implementation in @file{lib/kernel/list.c}.
 
 A @dfn{lock} is like a semaphore with an initial value of 1
 (@pxref{Semaphores}).  A lock's equivalent of ``up'' is called
-``acquire'', and the ``down'' operation is called ``release''.
+``release'', and the ``down'' operation is called ``acquire''.
 
 Compared to a semaphore, a lock has one added restriction: only the
 thread that acquires a lock, called the lock's ``owner'', is allowed to