diff --git a/ChangeLog b/ChangeLog
index def8de8d0f..503e836089 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed May 12 15:45:36 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* lib/rdoc/generator/ri.rb (generate): should load existing cache
+	  before generating it.
+
 Wed May 12 15:04:57 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ext/bigdecimal/lib/bigdecimal/math.rb (BigMath#log): improved
diff --git a/lib/rdoc/generator/ri.rb b/lib/rdoc/generator/ri.rb
index ad9932a02a..819eb52d40 100644
--- a/lib/rdoc/generator/ri.rb
+++ b/lib/rdoc/generator/ri.rb
@@ -29,6 +29,8 @@ class RDoc::Generator::RI
   def generate top_levels
     install_siginfo_handler
 
+    @store.load_cache
+
     RDoc::TopLevel.all_classes_and_modules.each do |klass|
       @current = "#{klass.class}: #{klass.full_name}"