functionnote

noun
UK /ˈfʌŋkʃən nəʊt/
US /ˈfʌŋkʃən noʊt/

A functionnote is a short written message that tells you what something does or how it works.

The teacher left a functionnote on the robot so we knew which button made it walk.


OTHER MEANINGS

2. A small note attached to a machine part that explains its job.

Read the functionnote before you turn the dial.

3. A quick reminder written down about what a tool is for.

He wrote a functionnote on the box of the drill.

4. A short line in a program that says what a piece of code does.

Add a functionnote above the loop so others understand it.