diff --git a/README.md b/README.md
index 5861d30..60f4f9e 100644
--- a/README.md
+++ b/README.md
@@ -90,6 +90,7 @@ The following custom properties and mixins are available for styling:
 | `--paper-icon-button` | Mixin for a button | `{}` |
 | `--paper-icon-button-disabled` | Mixin for a disabled button | `{}` |
 | `--paper-icon-button-hover` | Mixin for button on hover | `{}` |
+| `--paper-icon-button-iron-icon` | Mixin for iron-icon | `{}` |
 
 
 
diff --git a/paper-icon-button.html b/paper-icon-button.html
index 3d85720..ea803d2 100644
--- a/paper-icon-button.html
+++ b/paper-icon-button.html
@@ -63,6 +63,7 @@
 `--paper-icon-button` | Mixin for a button | `{}`
 `--paper-icon-button-disabled` | Mixin for a disabled button | `{}`
 `--paper-icon-button-hover` | Mixin for button on hover | `{}`
+`--paper-icon-button-iron-icon` | Mixin for iron-icon | `{}`
 
 @group Paper Elements
 @element paper-icon-button
@@ -122,6 +123,7 @@
       iron-icon {
         --iron-icon-width: 100%;
         --iron-icon-height: 100%;
+        @apply --paper-icon-button-iron-icon
       }
     </style>