diff --git a/lib/6to5/transformation/transformers/es6/classes.js b/lib/6to5/transformation/transformers/es6/classes.js
index <HASH>..<HASH> 100644
--- a/lib/6to5/transformation/transformers/es6/classes.js
+++ b/lib/6to5/transformation/transformers/es6/classes.js
@@ -207,7 +207,7 @@ ClassTransformer.prototype.buildBody = function () {
 };
 
 /**
- * Push a method to it's respective mutatorMap.
+ * Push a method to its respective mutatorMap.
  *
  * @param {Node} node MethodDefinition
  */
Use the posessive form of "its", not a contraction of "it is".