add the libsais license to EXTRA_DIST
diff --git a/Makefile.am b/Makefile.am
index 782cb30..dbf2847 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -3,7 +3,7 @@ ACLOCAL_AMFLAGS = -I build-aux
AM_CFLAGS = -I$(top_srcdir)/include
AM_LDFLAGS = -avoid-version
-EXTRA_DIST = LICENSE PORTING.md README.md build-aux/git-version-gen
+EXTRA_DIST = LICENSE libsais-LICENSE PORTING.md README.md build-aux/git-version-gen
pkgconfig_DATA = bzip3.pc
