diff --git a/doc/POST_INSTALL.md b/doc/POST_INSTALL.md
index bd29885..a0e8170 100644
--- a/doc/POST_INSTALL.md
+++ b/doc/POST_INSTALL.md
@@ -1,6 +1,5 @@
-Although you usually don't need them, here are the Postgresql admin user credentials:
-
-Username: __DB_USER__
-Password: __DB_PWD__
-
 You can connect to pgAdmin with your email and the password you provided at installation time.
+
+You will need to provide the Postgresql admin password once, so here it is: `__DB_PWD__`.
+
+pgAdmin will then store it encrypted, so you won't need anymore.
diff --git a/doc/POST_UPGRADE.d/7.7~ynh2.md b/doc/POST_UPGRADE.d/7.7~ynh2.md
new file mode 100644
index 0000000..bc743de
--- /dev/null
+++ b/doc/POST_UPGRADE.d/7.7~ynh2.md
@@ -0,0 +1,5 @@
+This upgrade fixes authentication with PostgreSQL.
+
+Here is the Postgresql admin password: `__DB_PWD__`.
+
+You can log into pgAdmin with your email and the password you provided during installation.