diff --git a/client/WEB-INF/classes/resources/messages.properties b/client/WEB-INF/classes/resources/messages.properties
index b913179b888..4a9a2a587a7 100644
--- a/client/WEB-INF/classes/resources/messages.properties
+++ b/client/WEB-INF/classes/resources/messages.properties
@@ -14,7 +14,7 @@ label.add.SRX.device=Add SRX device
 label.account.and.security.group=Account, Security group
 label.fetch.latest=Fetch latest
 label.system.offering=System Offering
-message.validate.instance.name=Instance name can not be longer than 63 characters. Only ASCII letters a~z, digits 0~9, hyphen are allowed. Must start with a letter and end with a letter or a digit.
+message.validate.instance.name=Instance name can not be longer than 63 characters. Only ASCII letters a~z, A~Z, digits 0~9, hyphen are allowed. Must start with a letter and end with a letter or a digit.
 label.action.register.template=Register template
 label.action.register.iso=Register ISO
 #new labels (end) ************************************************************************************************