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diff --git a/readme.md b/readme.md
index 4bd948e..ced8b1f 100644
--- a/readme.md
+++ b/readme.md
@@ -13,6 +13,7 @@ a simple utility that copies music and playlists from a folder to another folder
 
 - [inih](https://github.com/benhoyt/inih)
 - [cwalk](https://github.com/likle/cwalk)
+- [openssl](https://www.openssl.org/) (you probably already have this)
 
 ## config file