Accept tags consisting of only two letters, too.

public/js/autosuggest.js

@@ -69,7 +69,7 @@ AutoSuggest.prototype.onType = function(input, event) {
     }
 
     var tokens = input.value.split(/\s+/).filter(function(token) {
-        return token.length >= 3;
+        return token.length >= 2;
     });
 
     if (tokens.length === 0) {