jot

(noun) a brief (and hurriedly handwritten) note. Synonyms: jotting.

(noun) a slight but appreciable amount. Synonyms: touch, hint, tinge, mite, pinch, speck, soupcon. Example: "This dish could use a touch of garlic."

(verb) write briefly or hurriedly; write a short note of. Synonyms: jot down.