diff --git a/lib/legacy/legacy-element-mixin.html b/lib/legacy/legacy-element-mixin.html
index acb10a75a0..b9c83d538b 100644
--- a/lib/legacy/legacy-element-mixin.html
+++ b/lib/legacy/legacy-element-mixin.html
@@ -476,7 +476,7 @@
        * any `<content>` elements are replaced with the list of nodes distributed
        * to the `<content>`, the result of its `getDistributedNodes` method.
        * @this {Element}
-       * @return {Array<Node>} List of effctive child nodes.
+       * @return {Array<Node>} List of effective child nodes.
        */
       getEffectiveChildNodes() {
         return /** @type {Polymer.DomApi} */ (Polymer.dom(this)).getEffectiveChildNodes();
@@ -500,7 +500,7 @@
        * any `<content>` elements are replaced with the list of elements
        * distributed to the `<content>`.
        *
-       * @return {Array<Node>} List of effctive children.
+       * @return {Array<Node>} List of effective children.
        */
       getEffectiveChildren() {
         let list = this.getEffectiveChildNodes();
@@ -514,7 +514,7 @@
        * text content's of the element's effective childNodes (the elements
        * returned by <a href="#getEffectiveChildNodes>getEffectiveChildNodes</a>.
        *
-       * @return {string} List of effctive children.
+       * @return {string} List of effective children.
        */
       getEffectiveTextContent() {
         let cn = this.getEffectiveChildNodes();