diff --git a/README.md b/README.md
index 561f635d..4eaa751e 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,7 @@ For Debian (and probably other Linux distros, but the package names will
 probably differ), install the following additional packages:
 * pkg-config
 * xorg-dev
+* libgtk-3-dev
 
 ## Build