diff --git a/make.sh b/make.sh
index 065a7ad..90722fc 100755
--- a/make.sh
+++ b/make.sh
@@ -1,19 +1,23 @@
 #!/bin/sh
 
 usage() {
-    echo Usage: $0 '[run|build|clean]'
+    echo Usage: $0 '[run|build|watch|clean]'
 }
 
+if ! command -v tup >/dev/null; then
+    echo Error: You need tup installed: http://gittup.org/tup/ >&2
+    exit 1
+fi
+
 case $1 in
     run)
         $0 build >&2 || exit 1
         echo '' >&2  && ./Main
         ;;
+    watch)
+        tup monitor -f -a -j2 >&2
+        ;;
     build)
-        if ! command -v tup >/dev/null; then
-            echo Error: You need tup installed to build: http://gittup.org/tup/ >&2
-            exit 1
-        fi
         tup init 2>/dev/null
         tup >&2
         ;;