diff --git a/src/card/README.md b/src/card/README.md
index 8a43df55..4f17b8ef 100755
--- a/src/card/README.md
+++ b/src/card/README.md
@@ -115,6 +115,7 @@ The MDL CSS classes apply various predefined visual and behavioral enhancements
 | `mdl-shadow--2dp through mdl-shadow--8dp` | Assigns variable shadow depths (1-5) to card | Optional, goes on "outer" div; if omitted, no shadow is present |
 | `mdl-card__title` | Defines div as a card title container | Required on "inner" title div |
 | `mdl-card__title-text` | Assigns appropriate text characteristics to card title | Required on head tag (H1 - H6) inside title div |
+| `mdl-card__subtitle-text` | Assigns text characteristics to a card subtitile | Optional. Should be a child of the title element. |
 | `mdl-card__media` | Defines div as a card media container | Required on "inner" media div |
 | `mdl-card__supporting-text` | Defines div as a card body text container and assigns appropriate text characteristics to body text | Required on "inner" body text div; text goes directly inside the div with no intervening containers |
 | `mdl-card__actions` | Defines div as a card actions container and assigns appropriate text characteristics to actions text | Required on "inner" actions div; content goes directly inside the div with no intervening containers |