diff --git a/src/database/sql/sql.go b/src/database/sql/sql.go
index c8666653ba..355b6aa300 100644
--- a/src/database/sql/sql.go
+++ b/src/database/sql/sql.go
@@ -738,7 +738,9 @@ func (db *DB) Ping() error {
 	return db.PingContext(context.Background())
 }
 
-// Close closes the database, releasing any open resources.
+// Close closes the database and prevents new queries from starting.
+// Close then waits for all queries that have started processing on the server
+// to finish.
 //
 // It is rare to Close a DB, as the DB handle is meant to be
 // long-lived and shared between many goroutines.