diff --git a/docs/01-readme.md b/docs/01-readme.md
index 4c79f9ef..573de5ee 100644
--- a/docs/01-readme.md
+++ b/docs/01-readme.md
@@ -39,6 +39,7 @@ environment):
 - [libxcb-util >= 0.3.8](https://xcb.freedesktop.org/)
 - [libxcb-keysyms >= 0.3.4](https://xcb.freedesktop.org/)
 - [libxcb-icccm >= 0.3.8](https://xcb.freedesktop.org/)
+- [xcb-util-xrm >= 1.0](https://github.com/Airblader/xcb-util-xrm)
 - [libxkbcommon](http://xkbcommon.org/) with X11 support enabled
 - [libstartup-notification >=
   0.10](https://www.freedesktop.org/wiki/Software/startup-notification/)