fixes #221

Author: wumpz

README.md

@@ -38,6 +38,7 @@ Also I would like to know about needed examples or documentation stuff.
 
 ## Extensions in the latest SNAPSHOT version 0.9.5
 
+* support for **ALTER TABLE mytable ADD CONSTRAING name PRIMARY KEY (col)**
 * support for **INSERT LOW_PRIORITY INTO**
 * support for **ORDER BY** and **LIMIT** in **UPDATE** and **DELETE** statements