diff --git a/src/locales/en.json b/src/locales/en.json
index ef36ae42..2c3b9126 100644
--- a/src/locales/en.json
+++ b/src/locales/en.json
@@ -75,7 +75,7 @@
     "confirm_delete": "Are you sure you want to delete %s ?",
     "confirm_firewall_open": "Are you sure you want to open port %s? (protocol: %s, connection: %s)",
     "confirm_firewall_close": "Are you sure you want to close port %s? (protocol: %s, connection: %s)",
-    "confirm_install_custom_app": "Installing 3rd party applications may compromise the security of your system. Use at your own risk.",
+    "confirm_install_custom_app": "WARNING ! Installing 3rd party applications may compromise the integrity and security of your system. You should probably NOT install it unless you know what you are doing. Are you willing to take that risk ?",
     "confirm_install_domain_root": "You will not be able to install any other app on %s. Continue ?",
     "confirm_install_app_warning": "Warning : this application may work but is not well-integrated in YunoHost. Some features such as single sign-on and backup/restore might not be available.",
     "confirm_install_app_danger": "WARNING ! This application is still experimental and is likely to break your system ! You should probably NOT install it unless you know what you are doing. Are you willing to take that risk ?",