diff --git a/.planning/phases/33-seo-output-audit-and-content/COVERAGE.md b/.planning/phases/33-seo-output-audit-and-content/COVERAGE.md
index 8f49bc8c..4b919cef 100644
--- a/.planning/phases/33-seo-output-audit-and-content/COVERAGE.md
+++ b/.planning/phases/33-seo-output-audit-and-content/COVERAGE.md
@@ -6,12 +6,13 @@
 |---|---|---|
 | bulk URL submission (POST JSON {host, key, urlList} to api.indexnow.org) | INTEGRATE | |
 | key generation (32 hex characters from crypto/rand) and key rotation | INTEGRATE | |
-| key file served at the site root (/<key>.txt) | INTEGRATE | |
+| key file served at the site root (/<key>.txt; the plugin serves GET /_sitemap/indexnow/<key>.txt, the SEO layer maps the root name) | INTEGRATE | |
 | success answers 200 and 202 recorded as the last notification | INTEGRATE | |
 | 400 bad request recorded in the last status | INTEGRATE | |
 | 403 key not valid shown in the admin (S2 err_key) | INTEGRATE | |
 | 422 URLs not matching the host shown in the admin (S2 err_host) | INTEGRATE | |
 | 429 too many requests: retry with the job's attempts, shown in S2 (err_rate) | INTEGRATE | |
+| 5xx server errors and network failures: retry with the job's attempts (five) | INTEGRATE | |
 | batching at most 10 000 URLs per request | INTEGRATE | |
 | notification of new, changed and removed URLs (rebuild diff) | INTEGRATE | |
 | keyLocation parameter (key file elsewhere on the host) | OPT-OUT | the key file is served at the root, which covers every URL of the host; a key file elsewhere would narrow the URLs the key may submit |