Add mention of visibility.
diff --git a/common/README.md b/common/README.md
index 7ed66c7..e7e3006 100644
--- a/common/README.md
+++ b/common/README.md
@@ -8,5 +8,5 @@
   * MoreTypes - utilities and Equivalence wrappers for TypeMirror and related subtypes
   * MoreElements - utilities for Element and related subtypes
   * SuperficialValidation - very simple scanner to ensure an Element is valid and free from distortion from upstream compilation errors
-  
-  
+  * Visibility - utilities for working with Elements' visibility levels (public, protected, etc.)
+