diff --git a/Makefile.am b/Makefile.am
index 185127e..9c901ea 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -13,7 +13,7 @@
 dist-hook:
 	echo $(VERSION) > $(distdir)/.tarball-version
 
-EXTRA_DIST = git-version-gen .version
+EXTRA_DIST = git-version-gen .version doc/osmocom-authn-protocol.txt
 
 if HAVE_DOXYGEN