View Source ExTDLib.Method.SetStickerKeywords (ExTDLib v0.0.4)

Changes the list of keywords of a sticker; for bots only. The sticker must belong to a regular or custom emoji sticker set created by the bot. Returns object_ptr<Ok>.

NameTypeDescription
stickerInputFileSticker.
keywordsstringList of up to 20 keywords with total length up to 64 characters, which can be used to find the sticker.

More details on telegram's documentation.