Supplementary used in a sentence

Supplementary in a sentence as an adjective

You have concepts like "lower thirds" for supplementary text and images, or 20% safe areas around the edges of the screen.

I try to teach genuine mathematics to elementary school pupils in supplementary classes during the weekends.

The parentheses are a subtle way of telling a user that it's not critical information, but rather a supplementary datum which can be safely ignored by default.

Section 6 of the supplementary material, which explores the idea of building more complex circuits and the scaling issues therewith, is unfortunately missing right now. I notified the authors and I'm sure that will be fixed soon.

Instead, I worked every non-trivial problem in the book including the more advanced supplementary problems in the back where she never made any assignments.

There is a huge difference between low-quality video/audio recording of a prof mumbling for an hour and post-processed, perfected snippets of videos presented in a coherent fashion, and most importantly with supplementary materials that encourage people to actually apply their knowledge and get feedback.