diff --git a/.gdbinit b/.gdbinit
index 61c18cdf45..2a38da8892 100644
--- a/.gdbinit
+++ b/.gdbinit
@@ -269,7 +269,7 @@ define rp
   else
   if ($flags & RUBY_T_MASK) == RUBY_T_DATA
     if ((struct RTypedData *)($arg0))->typed_flag == 1
-      printf "T_DATA(typed): "
+      printf "T_DATA(%s): ", ((struct RTypedData *)($arg0))->type->wrap_struct_name
       print (struct RTypedData *)($arg0)
     else
       printf "T_DATA: "
diff --git a/ChangeLog b/ChangeLog
index a979125e91..1538b39511 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sat Jun  5 16:39:13 2010  Tanaka Akira  <akr@fsij.org>
+
+	* .gdbinit (rp): show type name for RTypedData.
+
 Sat Jun  5 15:59:08 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ruby.c (process_options, load_file_internal): $0 seen from