diff --git a/README.txt b/README.txt
index 8c7fa44..37f9cf2 100644
--- a/README.txt
+++ b/README.txt
@@ -8,6 +8,7 @@ Some external dependency information are list here:
 3.YahooSearchTerms: You could grabe hot keyword from http://tw.yahoo.com.
 4.sqlite-cerod-see: Commerical SQLite Compressed and Encrypted Read-Only Database (CEROD) Extension, please check http://www.hwaci.com/sw/sqlite/cerod.html
 5.DotMacKit.framework and PackageMaker.app: You can get it from Apple development kit.
+6.CTGradient is licensed under http://creativecommons.org/licenses/by/2.5/ .
 
 [1]. http://tw.media.yahoo.com/keykey/
 [2]. http://openvanilla.org/