- Both <sys/sx.h> and <sys/mutex.h> depend on <sys/types.h> and

<sys/lock.h>.
- <sys/sx.h> depends on <sys/mutex.h>.

share/man/man9/mutex.9

@@ -50,6 +50,8 @@
 .Nm mtx_assert
 .Nd kernel synchronization primitives
 .Sh SYNOPSIS
+.Fd #include <sys/types.h>
+.Fd #include <sys/lock.h>
 .Fd #include <sys/mutex.h>
 .Ft int
 .Fn mtx_init "struct mtx *mutex" "char *name" "int opts"

share/man/man9/sx.9

@@ -39,6 +39,9 @@
 .Nm sx_xunlock
 .Nd kernel shared/exclusive lock.
 .Sh SYNOPSIS
+.Fd #include <sys/types.h>
+.Fd #include <sys/lock.h>
+.Fd #include <sys/mutex.h>
 .Fd #include <sys/sx.h>
 .Ft void
 .Fn sx_init "struct sx *sx" "const char *description"