diff --git a/lib/mixins/element-mixin.html b/lib/mixins/element-mixin.html
index 3d6cec9e8a..a84076dcb1 100644
--- a/lib/mixins/element-mixin.html
+++ b/lib/mixins/element-mixin.html
@@ -103,7 +103,7 @@
 
     /**
      * Returns the `properties` object specifically on `klass`. Use for:
-     * (1) super chain mixes togther to make `propertiesForClass` which is
+     * (1) super chain mixes together to make `propertiesForClass` which is
      * then used to make `observedAttributes`.
      * (2) properties effects and observers are created from it at `finalize` time.
      *