diff --git a/ChangeLog b/ChangeLog
index 224c2ea6d2..486232c14f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Mar 11 22:31:25 2014  Kazuki Tsujimoto  <kazuki@callcc.net>
+
+	* ext/.document: add objspace/objspace_dump.c to document file.
+
 Tue Mar 11 22:22:38 2014  Kazuki Tsujimoto  <kazuki@callcc.net>
 
 	* test/objspace/test_objspace.rb (TestObjSpace#test_dump_uninitialized_file):
diff --git a/ext/.document b/ext/.document
index 1de3ab739b..3ec93005b8 100644
--- a/ext/.document
+++ b/ext/.document
@@ -43,6 +43,7 @@ mathn/rational/rational.c
 nkf/lib
 nkf/nkf.c
 objspace/objspace.c
+objspace/objspace_dump.c
 objspace/object_tracing.c
 openssl/lib
 openssl/ossl.c