diff --git a/lib/index.js b/lib/index.js
index 6d75e81..f7a0b3a 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -15,9 +15,13 @@ var spoken = require('spoken-numbers');
 function GrammarGenerator() {
   //(function constructor(self) {})(this);
 }
+GrammarGenerator.prototype.normalizeTextValue = function (value) {
+  return (value + '').toLocaleLowerCase().trim();
+};
 GrammarGenerator.prototype.replaceTopicReferenceWithValue = function (model, topicReference, value) {
+  var self = this;
   var topicReferenceToken = '{' + topicReference + '}';
-  var valueToken = '{' + value + '|' + topicReference + '}';
+  var valueToken = '{' + self.normalizeTextValue(value) + ' | ' + topicReference + '}';
   return model.replace(topicReferenceToken, valueToken);
 };
 GrammarGenerator.prototype.getNextTopicReference = function (model) {