diff --git a/newsfragments/postgresql-version-prompt.feature b/newsfragments/postgresql-version-prompt.feature
new file mode 100644
index 0000000..379b515
--- /dev/null
+++ b/newsfragments/postgresql-version-prompt.feature
@@ -0,0 +1,2 @@
+* Avoid to crash if postgresql-version is not set, adding prompt option.
+* add extra text to mention postgresql version constraints.
diff --git a/odoo_openupgrade_wizard/cli/cli_init.py b/odoo_openupgrade_wizard/cli/cli_init.py
index 79ef49e..c3bfc44 100644
--- a/odoo_openupgrade_wizard/cli/cli_init.py
+++ b/odoo_openupgrade_wizard/cli/cli_init.py
@@ -39,11 +39,15 @@ from odoo_openupgrade_wizard.tools.tools_system import (
 @click.option(
     "--postgresql-version",
     required=True,
+    prompt=True,
     help="The version of postgresql that will be used"
     " to create the postgresql container.Ex : '9.1', '16', ..."
     " The version should be available in docker hub."
     " (https://hub.docker.com/_/postgres)"
-    " avoid the 'latest' version if you want a deterministic installation.",
+    " avoid the 'latest' version if you want a deterministic installation."
+    " Key Point: If your current production server uses Postgresql version A"
+    " and if your future production server usees Postgresql version B,"
+    " you should select here a version X, with A <= X <= B.",
 )
 @click.option(
     "--extra-repository",