diff --git a/README.md b/README.md
index 51ed474..9d42769 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ See full CDM specification file on our github [wiki](https://github.com/OHDSI/Co
 
 Release Notes
 =============
-This version is based on this CDM working group proposal [#60](https://github.com/OHDSI/CommonDataModel/issues/60) and [#59](https://github.com/OHDSI/CommonDataModel/issues/59). The proposed and accepted changes include adding a datetime field to every table that had a date column and adding field DENOMINATOR_VALUE to the DRUG_STRENGTH table. These were the new columns added:
+This version is based on the CDM working group proposal [#60](https://github.com/OHDSI/CommonDataModel/issues/60) and [#59](https://github.com/OHDSI/CommonDataModel/issues/59) and is **backwards compatibile with v5.0.1**. The proposed and accepted changes include adding a datetime field to every table that had a date column and adding field DENOMINATOR_VALUE to the DRUG_STRENGTH table. These were the new columns added:
 
 **PERSON**  
 * birth_datetime, not required