diff --git a/HACKING.md b/HACKING.md
index 73be169..3fc9016 100644
--- a/HACKING.md
+++ b/HACKING.md
@@ -44,8 +44,8 @@ You can now run the python script. Example:
 $ $HOME/redshift/root/bin/redshift-gtk
 ```
 
-Depenencies
------------
+Dependencies
+------------
 
 * autotools, gettext
 * libdrm (Optional, for DRM support)
@@ -53,6 +53,9 @@ Depenencies
 * libX11, libXxf86vm (Optional, for VidMode support)
 * geoclue (Optional, for geoclue support)
 
+* python3, pygobject, pyxdg (Optional, for GUI support)
+* appindicator (Optional, for Ubuntu-style GUI status icon)
+
 
 Creating a new release
 ----------------------