diff --git a/core/sjcl.js b/core/sjcl.js
index e3644217..90c91b51 100644
--- a/core/sjcl.js
+++ b/core/sjcl.js
@@ -55,6 +55,12 @@ var sjcl = {
     bug: function(message) {
       this.toString = function() { return "BUG: "+this.message; };
       this.message = message;
+    },
+
+    /** @class Something isn't ready. */
+    notready: function(message) {
+      this.toString = function() { return "NOT READY: "+this.message; };
+      this.message = message;
     }
   }
 };