diff --git a/README.md b/README.md
index 5e32b0e..9584f85 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,15 @@
 # xkcdlock
 A wrapper around screen lockers to display xkcd images
+
+Depending on the given arguments xkcdlock shows a random image, the latest
+image or an image of choice.
+
+Note that 'latest' needs an internet connection for the download!
+If the download fails it falls back to a specific hard-coded image
+
+Builtin is a function to download all images.
+
+Dependencies: rbash, i3lock, xrandr, awk, curl,
+              convert (from imagick)
+
+Use 'xkcdlock -h' to show the command help.
diff --git a/xkcdlock b/xkcdlock
index 67a9a78..cb81bd0 100755
--- a/xkcdlock
+++ b/xkcdlock
@@ -2,7 +2,10 @@
 
 # xkcd_lock v1
 #
-# A wrapper around i3lock to display xkcd images on the lock screen
+# A wrapper around screen lockers to display xkcd images on the lock screen
+#
+# Depending on the given arguments xkcdlock shows a random image, the latest
+# image or an image of choice.
 #
 # Note that 'latest' needs an internet connection for the download!
 # If the download fails it falls back to a specific hard-coded image
@@ -241,6 +244,8 @@ main() {
         l)
             if [[ "sway"="${OPTARG}" ]]; then
                LOCK_BIN="swaylock"
+               echo "Not yet implemented since we have no xrandr with wayland"
+               exit 1
             fi
             ;;
         m)