diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4d81c45a6..8f35382fa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ### Added
-* When a transfer fails, the transfer should remain available in the db for at least 12 weeks, as per spec.
+* When a transfer fails, the transfer should remain available in the db for at least 12 weeks (84 days), as per spec.
 * When mapping a `DocumentReference` which contains a `NOPAT` `meta.security` or `NOPAT` `securityLabel` tag the resultant XML for that resource
   will contain a `NOPAT` `confidentialityCode` element.
 * When mapping `AllergyIntolerances` which contain a `NOPAT` `meta.security` tag the resultant XML for that resource
diff --git a/OPERATING.md b/OPERATING.md
index 863eef338..3ed2ffc64 100644
--- a/OPERATING.md
+++ b/OPERATING.md
@@ -266,7 +266,7 @@ The adaptor's database records:
 * metadata about the transfer process
 
 The supplier MUST configure the `GP2GP_MONGO_TTL` variable to remove the database records
-after a reasonable time period. The specs say 12 weeks, so this is our suggestion.
+after a reasonable time period. The specs say 12 weeks (84 days), so this is our suggestion.
 
 The adaptor's queued messages contain:
 * the patient's NHS number