diff --git a/app/assets/javascripts/darkswarm/directives/max.js.coffee b/app/assets/javascripts/darkswarm/directives/max.js.coffee
new file mode 100644
index 0000000000..ed3d7b3253
--- /dev/null
+++ b/app/assets/javascripts/darkswarm/directives/max.js.coffee
@@ -0,0 +1,6 @@
+Darkswarm.directive "max",  ->
+  restrict: 'A'
+  link: (scope, elem, attr)->
+    elem.bind 'input', ->
+      if elem.val() > +attr.max
+        elem.val attr.max