I am confused with the usage of the word supplement.
A similar usage might be
a 16-page advertising supplement
where it means
an additional part of a book, newspaper, report etc
Following is the example to illustrate the question.
Here are some steps to copy/paste some content from web browser to a text editor.
1. select the content on the web browser
2. ctrl + C
3. click the text editor
4. ctrl + V
In this context, is following expressions appropriate?
Here are 2 supplements
1. for Mac user, ...
2. for Linux user,...
Another example
I asked a question
What does "⇒𝑦" mean?
...
then I add a supplement
according to @Joe's answer, ⇒𝑦 is called the “always positive” classifier in the book
...
Could this be A supplement?