diff --git a/doc/src/sgml/ref/reindex.sgml b/doc/src/sgml/ref/reindex.sgml
index 21e2e91d896..d5d63ff7e72 100644
--- a/doc/src/sgml/ref/reindex.sgml
+++ b/doc/src/sgml/ref/reindex.sgml
@@ -453,14 +453,17 @@ Indexes:
If the index marked INVALID is suffixed
- ccnew, then it corresponds to the transient
+ _ccnew, then it corresponds to the transient
index created during the concurrent operation, and the recommended
recovery method is to drop it using DROP INDEX,
then attempt REINDEX CONCURRENTLY again.
- If the invalid index is instead suffixed ccold,
+ If the invalid index is instead suffixed _ccold,
it corresponds to the original index which could not be dropped;
the recommended recovery method is to just drop said index, since the
rebuild proper has been successful.
+ A nonzero number may be appended to the suffix of the invalid index
+ names to keep them unique, like _ccnew1,
+ _ccold2, etc.