diff --git a/core/connection.js b/core/connection.js
index 2832dfe73..dcebdd371 100644
--- a/core/connection.js
+++ b/core/connection.js
@@ -605,11 +605,14 @@ Blockly.Connection.prototype.setCheck = function(check) {
 
 /**
  * Get a connection's compatibility.
- * @return {Array} List of compatible value types.
+ * @return {Array} List of compatible value types.  Null if
+ *     all types are compatible.
+ * @public
  */
 Blockly.Connection.prototype.getCheck = function() {
   return this.check_;
 };
+
 /**
  * Change a connection's shadow block.
  * @param {Element} shadow DOM representation of a block or null.