From 7585d7bf8d5104b2594de91db4c2cab57adce694 Mon Sep 17 00:00:00 2001
From: Thomas Gazagnaire <thomas@gazagnaire.org>
Date: Thu, 15 Oct 2026 14:55:24 +0200
Subject: [PATCH] catalog: run the README query over the in-memory store

The usage example defined a query and never ran it, so nothing checked
what it answers.
---
 ocaml-catalog/README.md | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/ocaml-catalog/README.md b/ocaml-catalog/README.md
index f442e612a5..9bf581e99b 100644
--- a/ocaml-catalog/README.md
+++ b/ocaml-catalog/README.md
@@ -66,8 +66,19 @@ let adults db =
 ```
 
 `Catalog.insert`, `Catalog.update` and `Catalog.delete` write through the same
-table declarations. To try the library, `Catalog.of_mem` builds a catalog
-over the in-memory reference store.
+table declarations. `Catalog.of_mem` builds a catalog over the in-memory
+reference store, which is enough to run the query:
+
+```ocaml
+let db =
+  Catalog.of_mem
+    [ ("users", { Catalog.Spi.Mem.columns = [ "id"; "name" ]; rows = [] }) ]
+
+let () =
+  Catalog.insert db users { id = 7L; name = "alice" };
+  Catalog.insert db users { id = 42L; name = "bob" };
+  assert (List.map (fun u -> u.name) (adults db) = [ "bob" ])
+```
 
 ## API
 
-- 
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