AO3 will be down for about 15 hours starting at 08:00 UTC on January 21 (what time is that for me?) while we make some improvements to searching bookmarks and series, including:

• adding the ability to search, filter, and sort bookmarks by word count
• making sure bookmark search results are correct when you use tags containing letters and numbers
• preventing series blurbs from listing tags that were only used on draft works
• preventing series blurbs from listing tags used on restricted works for guests
• updating series bookmark search so it only searches the tags on works you can access

Please follow our status page for updates.