diff --git a/reports/README.md b/reports/README.md
index a4589fef07de..bdfbdb114b3d 100644
--- a/reports/README.md
+++ b/reports/README.md
@@ -47,4 +47,8 @@ This, most likely very unelegant, `jq` query filters the endpoints to only those
 
 ```jq
 jq '[ keys[] as $rp | .[$rp] | keys[] as $path | .[$path][] ] | map(select(.HttpVerbs != null) | select(.HttpVerbs | contains(["POST"])))' allEndpoints.json
-```
\ No newline at end of file
+```
+
+## `oldApiVersions.json`
+
+This file contains a list of all API versions that are older than the oldest previous default version for each resource provider. These API versions are good candidates for removal. Versions that are already explicitly removed via `vN-removed.json` are not included.