diff --git a/README.md b/README.md
index 98a580f..cc659e3 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,7 @@ These are in addition to what maubot requires by itself.
 
 - lxml
 - jinja2
+- [cryptocode](https://github.com/gdavid7/cryptocode)
 
 ### Installation