Error message about number of characters in the rule

When creating a new flag, and adding a rule (for example Targeted delivery), the name of the rule key can be maximum 64 characters. Entering more characters will end up in an error message saying:

"Updating test ruleset for flag [flag name] failed. Invalid key: may not be longer than 64 characters"

This is confusing, as the error refers to the length of the key name of the rule, and not to the name of the flag (which dos not have a limit of 64 characters). It would be more immediate to understand it if the error message showed the key name, and not the name of the flag, for example:

"Updating flag [flag name] failed because of invalid key name [rule name key]: the key name cannot be longer than 64 characters."

Thank you