diff --git a/README.md b/README.md
index b7ac3c6..88f4751 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,10 @@ Consider this alpha-quality: While it works, *everything* is subject to change w
 
 To display wldash on all outputs, set `WLDASH_ALL_OUTPUTS=1`. To cut size in half, set `WLDASH_SCALE=2`.
 
+## System dependencies
+
+`dbus`. See https://github.com/diwic/dbus-rs#requirements.
+
 ## How to use launcher
 
 The launcher for wldash is built-in, based on https://github.com/kennylevinsen/dot-desktop. Pluggable systems may come back in the future.