diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index 58b0a97..04e6450 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -4336,5 +4336,6 @@ TestForOldSnapshot_impl(Snapshot snapshot, Relation relation)
 		&& (snapshot)->whenTaken < GetOldSnapshotThresholdTimestamp())
 		ereport(ERROR,
 				(errcode(ERRCODE_SNAPSHOT_TOO_OLD),
-				 errmsg("snapshot too old")));
+				 errmsg("snapshot too old"),
+				 errdetail("One or more rows required by this query have already been removed from \"%s\"", RelationGetRelationName(relation))));
 }