diff --git a/src/BootstrapMixin.js b/src/BootstrapMixin.js
index 17c8e81d2b..98c05bd068 100644
--- a/src/BootstrapMixin.js
+++ b/src/BootstrapMixin.js
@@ -16,7 +16,7 @@ const BootstrapMixin = {
     bsStyle: React.PropTypes.oneOf(styleMaps.STYLES),
     /**
      * Size variants
-     * @type {("xsmall"|"small"|"medium"|"large")}
+     * @type {("xsmall"|"small"|"medium"|"large"|"xs"|"sm"|"md"|"lg")}
      */
     bsSize: CustomPropTypes.keyOf(styleMaps.SIZES)
   },
diff --git a/src/styleMaps.js b/src/styleMaps.js
index 49ad80f3f0..b64252732a 100644
--- a/src/styleMaps.js
+++ b/src/styleMaps.js
@@ -40,7 +40,11 @@ const styleMaps = {
     'large': 'lg',
     'medium': 'md',
     'small': 'sm',
-    'xsmall': 'xs'
+    'xsmall': 'xs',
+    'lg': 'lg',
+    'md': 'md',
+    'sm': 'sm',
+    'xs': 'xs'
   },
   GLYPHS: [
     'asterisk',