diff --git a/README.md b/README.md
index a6ee95c..ee24bef 100644
--- a/README.md
+++ b/README.md
@@ -76,6 +76,7 @@ hear this.
 Dependencies:
 * cdparanoia
 * ruby 1.9 and higher
+* ruby-base64 (gem)
 * ruby-rexml (gem)
 
 Suggested: