diff --git a/README.md b/README.md
index 25c9a0c4..7389e5e9 100644
--- a/README.md
+++ b/README.md
@@ -874,6 +874,7 @@ format.
   * Cedi Config https://github.com/ccadllc/cedi-config
   * Cfg https://github.com/carueda/cfg
   * circe-config https://github.com/circe/circe-config
+  * args4c https://github.com/aaronp/args4c
 
 #### Clojure wrappers for the Java library