diff --git a/INSTALL.md b/INSTALL.md
index b3f9105..a412484 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -6,6 +6,7 @@
 - Xt
 - Motif
 - A C compiler
+- brightnessctl (for xmbrightness)
 
 Installing via APK: