diff --git a/ext/sha1/MANIFEST b/ext/sha1/MANIFEST
new file mode 100644
index 0000000000..d946af1cd8
--- /dev/null
+++ b/ext/sha1/MANIFEST
@@ -0,0 +1,7 @@
+MANIFEST
+extconf.rb
+sha1-ruby.c
+sha1.c
+sha1.h
+sha1.txt
+sha1.txt.jp