Apple said its update would arrive "in the coming weeks".
It has previously said its notification summaries - which group together and rewrite previews of multiple recent app notifications into a single alert on users' lock screens - aim to allow users to "scan for key details".
"Apple Intelligence features are in beta and we are continuously making improvements with the help of user feedback," the company said in a statement on Monday, adding that receiving the summaries is optional.
"A software update in the coming weeks will further clarify when the text being displayed is summarization provided by Apple Intelligence. We encourage users to report a concern if they view an unexpected notification summary."
The feature, along with others released as part of its broader suite of AI tools was rolled out in the UK in December. It is only available on its iPhone 16 models, iPhone 15 Pro and Pro Max handsets running iOS 18.1 and above, as well as on some iPads and Macs.
Apple is not alone in having rolled out generative AI tools that can create text, images and more content when prompted by users - but with varying results.
Google's AI overviews feature, which provides a written summary of information from results at the top of its search engine in response to user queries, faced criticism last year for producing some erratic responses.
At the time a Google spokesperson said that these were "isolated examples" and that the feature was generally working well.