diff --git a/doc/Makefile.am b/doc/Makefile.am
index 884fa2a..b95e489 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -1,2 +1,3 @@
 EXTRA_DIST = README
-SUBDIRS = bitstring cprog kernel man oops record regexp unix usenix util xlib xt
+SUBDIRS = bitstring cprog kernel man oops record regexp unix usenix xlib xt
+DIST_SUBDIRS = $(SUBDIRS) util