diff --git a/MANIFEST b/MANIFEST
index 156fc725b0..ca86660b9b 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -119,6 +119,7 @@ doc/irb/irb.rd
 doc/irb/irb.rd.ja
 doc/shell.rd
 doc/shell.rd.ja
+ext/.document
 ext/Setup
 ext/Setup.atheos
 ext/Setup.dj