Document the lock type argument of mtx_init().

1 files changed, 5 insertions, 1 deletions

diff --git a/share/man/man9/mutex.9 b/share/man/man9/mutex.9
index b686c3fa014f..5003b9434078 100644
--- a/share/man/man9/mutex.9
+++ b/share/man/man9/mutex.9
@@ -56,7 +56,7 @@
 .In sys/lock.h
 .In sys/mutex.h
 .Ft void
-.Fn mtx_init "struct mtx *mutex" "const char *description" "int opts"
+.Fn mtx_init "struct mtx *mutex" "const char *description" "const char *type" "int opts"
 .Ft void
 .Fn mtx_lock "struct mtx *mutex"
 .Ft void
@@ -153,6 +153,10 @@ is saved rather than the data it points to.
 The data pointed to must remain stable
 until the mutex is destroyed.
 The
+.Fa type
+argument is the generic lock type for use with witness.  If this argument is
+NULL then the lock name is used as the lock type.
+The
 .Fa opts
 argument is used to set the type of mutex.
 It may contain either