diff --git a/docs/docs/concepts/rest/rest-api.md b/docs/docs/concepts/rest/rest-api.md
index d7c211405843..49351779ba91 100644
--- a/docs/docs/concepts/rest/rest-api.md
+++ b/docs/docs/concepts/rest/rest-api.md
@@ -30,6 +30,13 @@ order of `partitionSpecs`; use `{}` when a partition has no options. Custom loca
`path` option. Before registering custom locations, ensure that the REST server supports partition
options and all readers support custom locations.
+For an existing Format Table partition, omitting `path` keeps its location. Naming the partition's
+own default directory under the table asks the server to put it back there: the stored location is
+dropped, no data is deleted, and the request needs `replaceStatistics=true` with a
+`partitionStatistics` entry for the same spec. Any other path under the table location stays
+invalid, so a server that does not implement this rejects the request rather than storing it. A
+server also rejects additive statistics for a partition that already has a custom location.
+