The following comment:https://github.com/bitcoin-core/secp256k1/blob/7a2fff85e8729719f384a094123b965f45ae94db/src/ecmult_impl.h#L33-L41
appears quite confusing to me, as it refers to WINDOW_G, while residing in the code that sets WINDOW_A.
This comment became lingering and out of context since commit 6815761cf5500f1a619965c5b4bbc8918b334a35.
Removing it seems reasonable, as its content is already covered by the --with-ecmult-window configuration option help string. However, this would overlook its original purpose to document the ECMULT_WINDOW_SIZE definition when our build system is not used.