diff --git a/README.md b/README.md
index bc17420..5138baf 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,10 @@ re-activate your testkit vita after it expires
 only works if you have your activation files still  
 tm0:activate/act.dat & tm0:activate/actsig.dat  
 
+also due to a restriction in the firmware (probably added in 3.55)
+the SecureTick cannot be set to any date before 1/1/2015,
+so you will get error code 0x80251000 if your start activation date is before this time. 
+
 upon running activate.vpk your activation data will be backed up to pd0:/data/ and ux0:/data/ its highly recommended to make a copy on your PC as well.  
 
 pd0:data/ because its read-only and it remains even after updating or reinstalling the firmware. basicly it would be difficult to actidently delete them