diff --git a/lib/lemonad.js b/lib/lemonad.js
index <HASH>..<HASH> 100644
--- a/lib/lemonad.js
+++ b/lib/lemonad.js
@@ -85,6 +85,15 @@
       return _.snapshot(thing);
   };
 
+  // Combintaors
+  // -----------
+
+  L.not = function(pred) {
+    return function() {
+      return !pred.apply(null, arguments);
+    };
+  }
+
   // Useful tools
   // ------------
Added
ot as combinator