Why are mentions missing from some articles?

Inoreader recognizes mentions once, when an article arrives, and only in articles that are in English, French or German, long enough, and from an eligible feed: one with a Pro follower, one with 50 or more followers, a web feed, or a newsletter with a Pro follower. If none of that explains it, check that mentions aren't hidden under Preferences > Settings > Article contents > Mentions.

Check these first

1. Check that Preferences > Settings > Article contents > Mentions isn't set to Hide mentions.
2. Check the article's language, which has to be English, French or German, and its length.
3. For a small feed with no Pro follower, expect mentions on the articles that arrive after the feed qualifies.

Can I move or hide mentions in articles? shows how to restore hidden mentions. Social posts never show the Mentions: line.

Eligible feeds

Web feeds, feeds with at least one Pro follower and feeds with 50 or more followers are eligible, and a newsletter is when it has a Pro follower. Recognition doesn't depend on your own plan: once a feed is eligible, every reader of it sees the mentions, Free included.

Eligible articles

Only articles written in English, French or German are processed. Which languages work best with mentions? explains what happens with translated copies. Very short articles are skipped: an article needs about 35 words of text, 60 words in all, or a title of several words with some text. Only the title and the first 800 words are read, so a name that first appears later can be missed.

Recognition runs when an article is stored, and older articles are not processed again, so the articles that arrived before a feed became eligible stay without mentions.

A single lowercase word is never a mention, and uncertain matches are dropped.

Use a keyword instead

When a name isn't available as a mention, a keyword finds it in any article: in search, in a monitoring feed or as a Title or content condition in a rule. What is the difference between a mention and a keyword? explains how the two match, and Why is my monitoring feed not finding the articles I expect? covers a monitoring feed that misses them.

Mentions are a Pro feature, and once a feed is eligible its mentions show for every reader.