diff --git a/README.md b/README.md
index 2c886ec6..ef3214d1 100644
--- a/README.md
+++ b/README.md
@@ -26,10 +26,6 @@ Currently picrin is hosted on Github. You can freely send a bug report or pull-r
 
 https://github.com/picrin-scheme/picrin
 
-## IRC
-
-Our chat room is at #picrin channel, chat.freenode.org. IRC logs here: https://botbot.me/freenode/picrin/
-
 ## Build
 
 Just type `make` in the project root directory. You will find an executable binary newly created at bin/ directory.
diff --git a/lib/README.md b/lib/README.md
index a0bc6188..529910a5 100644
--- a/lib/README.md
+++ b/lib/README.md
@@ -1,6 +1,6 @@
 # libpicrin
 
-libpicrin is a super tiny scheme interpreter intended to be embedded in other applications such as game engine and network server. It provides a subset language of R7RS with several useful extensions. By default, libpicrin just contains some C files and headers and this README file. In embedding, you only need to copy the files into the project and add `include` dir to the include path.
+libpicrin is a super tiny scheme interpreter intended to be embedded in other applications such as game engine and network server. It provides a subset language of R7RS with several useful extensions. By default, libpicrin only contains some C files and headers and this README file. To embed, you only need to copy the files into the project and add `include` dir to the include path.
 
 Originally, libpicrin used to be the core component of [Picrin Scheme](https://github.com/picrin-scheme/picrin). They are currently maintained at separate repositories.
 
@@ -89,11 +89,7 @@ libpicrin utilize rope data structure to implement string type. Thanks to the im
 
 ### Dictionaries
 
-Dictionary is a hash table object. Its equivalence is tested with equal? procedure.
-
-### Attribute
-
-libpicrin has an facility to get or set metadata to any heap object.
+Dictionary is a hash table from symbol to object.
 
 ## Authors
 
@@ -101,7 +97,7 @@ See https://github.com/picrin-scheme/picrin for details.
 
 ## LICENSE
 
-Copyright (c) 2013-2014 Yuichi Nishiwaki and other picrin contributors
+Copyright (c) 2013-2017 Yuichi Nishiwaki and other picrin contributors
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of
 this software and associated documentation files (the "Software"), to deal in