diff --git a/doc/manual/rl-next/narinfo-cache-meta-ttl.md b/doc/manual/rl-next/narinfo-cache-meta-ttl.md
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+---
+synopsis: New setting `narinfo-cache-meta-ttl`
+prs: [15287]
+---
+
+The new setting `narinfo-cache-meta-ttl` controls how long binary cache metadata (i.e. `/nix-cache-info`) is cached locally, in seconds. This was previously hard-coded to 7 days, which is still the default. As a result, you can now use `nix store info --refresh` to check whether a binary cache is still valid.