diff --git a/packaging_apps.md b/packaging_apps.md
index df5e2bb6..78a256e6 100644
--- a/packaging_apps.md
+++ b/packaging_apps.md
@@ -66,7 +66,7 @@ yunohost app install https://github.com/author/my_app_package.git
 ### Enhance package
 Here is a list of best practices for application install scripts :
 * scripts should use `sudo cp -a ../sources/. $final_path` instead of `sudo cp -a ../sources/* $final_path`;
-* install script must contain support in case of script errors to delete residuals files thanks to `set -e` and `trap`;
+* install script must contain support in case of script errors to delete residuals files thanks to `set -e` and [`trap`](packaging_apps_trap_fr);
 * install script should use command line method instead of curl call through web install form;
 * install script should save install answers;
 * application sources should be checked with a control sum (sha256, sha1 or md5) or a PGP signature;
diff --git a/sitemap.md b/sitemap.md
index 62e88ceb..4075abbc 100644
--- a/sitemap.md
+++ b/sitemap.md
@@ -86,6 +86,7 @@
               * [Nginx configuration](packaging_apps_nginx_conf_en)
               * [Multi-instance](packaging_apps_multiinstance_en)
               * [Helpers](packaging_apps_helpers_en)
+              * [Trap usage](packaging_apps_trap_fr)
            * [Applications in progress](/apps_in_progress_en)
            * [Wishlist of applications](/apps_wishlist_en)
            * [Creation of system packages](/build_system_en)