diff --git a/packages/mdc-icon-button/foundation.ts b/packages/mdc-icon-button/foundation.ts
index 141718d4a89..d4e9524cc5f 100644
--- a/packages/mdc-icon-button/foundation.ts
+++ b/packages/mdc-icon-button/foundation.ts
@@ -30,7 +30,7 @@ import {cssClasses, strings} from './constants';
 export class MDCIconButtonToggleFoundation extends
     MDCFoundation<MDCIconButtonToggleAdapter> {
   /**
-   * Whether the icon button has an aria label that changes depending on
+   * Whether the icon button has an aria-label that changes depending on
    * toggled state.
    */
   private hasToggledAriaLabel = false;
@@ -65,7 +65,7 @@ export class MDCIconButtonToggleFoundation extends
       if (this.adapter.getAttr(strings.ARIA_PRESSED) !== null) {
         throw new Error(
             'MDCIconButtonToggleFoundation: Button should not set ' +
-            '`aria-pressed` if it has a toggled aria label.');
+            '`aria-pressed` if it has a toggled ARIA label.');
       }
 
       this.hasToggledAriaLabel = true;