diff --git a/readme.md b/readme.md
index 13daa0d..be77cf8 100644
--- a/readme.md
+++ b/readme.md
@@ -4,6 +4,9 @@ Billing for Multisite networks
 
 ## Changelog
 
+### 1.2.2
+- added `Requires PHP` plugin header
+
 ### 1.2.1
 - fixed Billing tab link in Edit Site (Network Admin) interface
 - adding basic Billing setting page for child sites under `/wp-admin/index.php?page=billing`