diff --git a/ChangeLog b/ChangeLog
index 6841cc36..c91aa63e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2008-07-13  Tatsuhiro Tsujikawa  <tujikawa at rednoah dot com>
+
+	Externalize messages.
+	* src/RequestGroupMan.cc
+	* src/message.h: Added MSG_SIGNATURE_SAVED, MSG_SIGNATURE_NOT_SAVED.
+
 2008-07-13  Tatsuhiro Tsujikawa  <tujikawa at rednoah dot com>
 
 	Use File::exists() instead of File::isFile() to allow non-regular file
diff --git a/src/RequestGroupMan.cc b/src/RequestGroupMan.cc
index 8f36ea68..d493cdf1 100644
--- a/src/RequestGroupMan.cc
+++ b/src/RequestGroupMan.cc
@@ -122,11 +122,9 @@ private:
       // ".sig".
       std::string signatureFile = group->getFilePath()+".sig";
       if(sig->save(signatureFile)) {
-	_logger->notice("Saved signature as %s. Please note that aria2 doesn't"
-			" verify signatures.", signatureFile.c_str());
+	_logger->notice(MSG_SIGNATURE_SAVED, signatureFile.c_str());
       } else {
-	_logger->notice("Saving signature as %s failed. Maybe file"
-			" already exists.", signatureFile.c_str());
+	_logger->notice(MSG_SIGNATURE_NOT_SAVED, signatureFile.c_str());
       }
     }
   }
diff --git a/src/message.h b/src/message.h
index da262ca1..31d1fe71 100644
--- a/src/message.h
+++ b/src/message.h
@@ -140,6 +140,10 @@
 #define MSG_NULL_TRACKER_RESPONSE _("Tracker returned null data.")
 #define MSG_WINSOCK_INIT_FAILD _("Windows socket library initialization failed")
 #define MSG_TIME_HAS_PASSED _("%d second(s) has passed. Stopping application.")
+#define MSG_SIGNATURE_SAVED _("Saved signature as %s. Please note that aria2"\
+			      " doesn't verify signatures.")
+#define MSG_SIGNATURE_NOT_SAVED _("Saving signature as %s failed. Maybe file"\
+				  " already exists.")
 
 #define EX_TIME_OUT _("Timeout.")
 #define EX_INVALID_CHUNK_SIZE _("Invalid chunk size.")