1 files changed, 11 insertions, 2 deletions
diff --git a/lib/completion.js b/lib/completion.js
index d36dc2e5..b5793437 100644
--- a/lib/completion.js
+++ b/lib/completion.js
@@ -449,9 +449,13 @@ var completion = (function() {
   }
 
   /** A meta-completer that delegates queries and merges and sorts the results of a collection of other
-   * completer instances. */
-  var MergingCompleter = function(sources) {
+   * completer instances given in :sources. The optional argument :queryThreshold determines how long a
+   * query has to be to trigger a refresh. */
+  var MergingCompleter = function(sources, queryThreshold) {
+    if (queryThreshold === undefined)
+      queryThreshold = 1; // default
     this.sources = sources;
+    this.queryThreshold = queryThreshold;
   }
   MergingCompleter.prototype = {
     refresh: function() {
@@ -459,6 +463,11 @@ var completion = (function() {
     },
 
     filter: function(query, callback) {
+      if (query.length < this.queryThreshold) {
+        callback([]);
+        return;
+      }
+
       var all = [];
       var counter = this.sources.length;