The phrase "an important footnote" is correct and usable in written English.
It can be used to highlight a significant additional piece of information or clarification related to the main text.
Example: "In the report, there is an important footnote that explains the methodology used in the study."
Alternatives: "a crucial note" or "a significant annotation".
But it added an important footnote to the message.
KAJIRO YAMAMOTO'S "Horse," the 1941 Japanese film opening today at the Film Forum 2, is an important footnote to cinema history but, like all footnotes, it needs a context, specifically, that of the Film Forum's current Akira Kurosawa retrospective.
Sir Patrick's entire life was a Boy's Own adventure, but he was an important footnote to the literary genre of English travel writing, which began in its modern form in 1844 with "Eothen", a hilarious account of Alexander Kinglake's adventures from Belgrade to Cairo .The Broken Road" has an elegiac tone.
And Palm Springs itself owns an important footnote in the history of American automotive design.
Here's an important footnote from Consumer Reports: Read the warning labels.
And in an important footnote on page 329, the document recognizes the risks inherent to asking remarried divorcees to "live like brothers and sisters".
And it pleases me immensely that when future historians look back on the liberation of copyright, a small but important footnote in the story will involve the BBC interviewing a man wearing a large cardboard cassette on his head.
That's largely what we found (with a few important footnotes) when we drove the V70R and S60R at Las Vegas Motor Speedway, where both road and oval portions of the track were available for use.
"Long live the United States," he said, before adding the important footnote, one every marine knows.
The point is noteworthy because that's long been called the most important footnote in constitutional law.
