linux – You do not know how to read the result of lsattr, where to find the legend?

When I launch the lsattr command, I receive the following result:

root @ swarm-stg-01: / etc # lsattr time zone
-------------- e --- time zone

But I do not understand how to read the output and man command does not contain this legend.

So what does the "e" mean and what is the meaning of the "e" chariot's position?