Index: share/man/man9/mutex.9
===================================================================
--- share/man/man9/mutex.9
+++ share/man/man9/mutex.9
@@ -74,7 +74,7 @@
 .Fn mtx_trylock "struct mtx *mutex"
 .Ft int
 .Fn mtx_trylock_flags "struct mtx *mutex" "int flags"
-.Ft void
+.Ft int
 .Fn mtx_trylock_spin "struct mtx *mutex"
 .Ft int
 .Fn mtx_trylock_spin_flags "struct mtx *mutex" "int flags"