Crossword puzzle clue "book's end matter that's impossible to understand"

Here are the possible solutions for book's end matter that's impossible to understand clue

Answer
Clue
Relevancy
complexindex
Clue
Book's end matter that's impossible to understand?
clearasmud
Clue
Impossible to understand
addenda
Clue
End-of-book matter
Definition
ADDENDUM, (Latin) something to be added
age
Clue
"___ is an issue of mind over matter.If you don't mind, it doesn't matter." (Mark Twain)
Definition
to grow old
idea
Clue
Matter for the gray matter
Gray matter matter?
Gray matter matter
Definition
a conception or a plan
makeamentalnote
Clue
Put some matter in the gray matter?

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