diff --git a/HowtoPostgreSQL.md b/HowtoPostgreSQL.md
index 5a4c9b9f..e7805a99 100644
--- a/HowtoPostgreSQL.md
+++ b/HowtoPostgreSQL.md
@@ -1295,3 +1295,27 @@ RemainAfterExit=on
 [Install]
 WantedBy=multi-user.target
 ~~~
+
+### Activer module `pgcrypto`
+
+Dans le *shell* `psql` :
+
+~~~
+hostname=# drop extension pgcrypto;
+hostname=# create extension pgcrypto;
+~~~
+
+Pour vérifier :
+
+~~~
+hostname=# select pg_get_functiondef(to_regproc('gen_random_uuid'));
+                    pg_get_functiondef
+-----------------------------------------------------------
+ CREATE OR REPLACE FUNCTION public.gen_random_uuid()      +
+  RETURNS uuid                                            +
+  LANGUAGE c                                              +
+  PARALLEL SAFE                                           +
+ AS '$libdir/pgcrypto', $function$pg_random_uuid$function$+
+
+(1 row)
+~~~
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