Quality is in the details — and attention to commas, semicolons, dangling participles, gerunds and the proper placement of quotation marks says to the reader that this person is careful ...

Viral Video Comedy watch: A cappella performance shows why correct placement of commas is so essential ‘We will discover how the commas shape the prose!’ ...

Those headline writers are clever people, so my guess is that the comma was omitted intentionally as a play on words. Jim's query, however, underscores the importance of correct comma placement.