Comma with 'Such As' or 'Like'
The Comma
Rulebase Summary
When 'such as' or 'like' introduces a required or necessary explanation or example, do not use a comma before it. When the explanation is unnecessary (the sentence would be complete without it), use a comma before it.
Morson's Rule 72 · p.45
Examples
✗
A. Certain documents, such as tax returns were never produced.
✓
A. Certain documents, such as tax returns, were never produced.
Nonessential 'such as' — needs a closing comma too.
✗
A. A medication like warfarin requires regular monitoring.
✓
A. A medication, like warfarin, requires regular monitoring.
Nonessential 'like' clause set off with commas.
Style Guide References (1)
Morson's
Rule 72
Page 45