diff --git a/paper/paper.ms b/paper/paper.ms
index 7fe9ccb..272fb9e 100644
--- a/paper/paper.ms
+++ b/paper/paper.ms
@@ -974,6 +974,11 @@ This should help put things into perspective.
 .
 .SECTION Alternatives
 Other approaches have been used beside SQL.
+
+.B "Memcached"
+
+.B "duckdb"
+
 .TBD
 .
 .SECTION Future work