make the message more clear

language/en-GB/en-GB.com_users.ini

@@ -147,7 +147,7 @@ COM_USERS_RESET_COMPLETE_LABEL="To complete the password reset process, please e
 COM_USERS_RESET_COMPLETE_SUCCESS="Reset password successful. You may now login to the site."
 COM_USERS_RESET_CONFIRM_ERROR="Error while confirming the password."
 COM_USERS_RESET_CONFIRM_FAILED="Your password reset confirmation failed because the verification code was invalid. %s"
-COM_USERS_RESET_CONFIRM_LABEL="An email has been sent to your email address. The email has a verification code, please paste the verification code in the field below to prove that you are the owner of this account."
+COM_USERS_RESET_CONFIRM_LABEL="An email has been sent to your email address. The email has a verification code, please paste the verification code in the field below, if it has not yet been filled, to prove that you are the owner of this account."
 COM_USERS_RESET_COMPLETE_TOKENS_MISSING="Your password reset confirmation failed because the verification code was missing."
 COM_USERS_RESET_REQUEST_ERROR="Error requesting password reset."
 COM_USERS_RESET_REQUEST_FAILED="Reset password failed: %s"