File attributes puzzle

[Anne Wilson]

I have a small text file that I want to ensure cannot be accidentally deleted, 
so I ran 

chattr -i /home/anne/WebPages/UserBase/filename.txt

(as root, of course).  Running lsattr against the same file produced 

-------------e- /home/anne/WebPages/UserBase/filename.txt

'i' doesn't show in ls -l filename, either.  I haven't come across 'e' before.  
What is it, and is my file immutable or not?

Anne
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