diff --git a/bin/surf-display b/bin/surf-display
index dbc6fb5..b116060 100755
--- a/bin/surf-display
+++ b/bin/surf-display
@@ -24,19 +24,15 @@
 # Free Software Foundation, Inc.,
 # 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
 
-# dependencies:
-#     surf
-#     wmctrl
-#     matchbox-window-manager
-#     pulseaudio-utils
-#     xprintidle
-#     xdotool
-#     xmodmap
-#     x11-xkb-utils
-#
-# recommendations:
-#     unclutter
-#     x11-xserver-utils
+for i in surf  wmctrl  blackbox  xdotool  xmodmap  unclutter
+do
+    if ! type $i
+    then
+        echo "$i is missing"
+        exit 1
+    fi
+done
+
 
 VERSION="0.1.0"