diff --git a/docs/admin/update-searxng.rst b/docs/admin/update-searxng.rst
index 15735b0ba..c2a34aeee 100644
--- a/docs/admin/update-searxng.rst
+++ b/docs/admin/update-searxng.rst
@@ -94,6 +94,20 @@ searx from or try::
    If you are migrate from searx take into account that the ``.config.sh`` is no
    longer used.
 
+If you upgrade from searx or from before :pull:`1332` has been merged and you
+have filtron and/or morty installed, don't forget to remove HTTP sites.
+
+Apache::
+
+  $ sudo -H ./utils/filtron.sh apache remove
+  $ sudo -H ./utils/morty.sh apache remove
+
+nginx::
+
+  $ sudo -H ./utils/filtron.sh nginx remove
+  $ sudo -H ./utils/morty.sh nginx remove
+
+
 
 Check after Installation
 ------------------------
diff --git a/utils/filtron.sh b/utils/filtron.sh
index ab207bbd8..7607bf6aa 100755
--- a/utils/filtron.sh
+++ b/utils/filtron.sh
@@ -4,11 +4,15 @@
 
 # shellcheck source=utils/lib.sh
 source "$(dirname "${BASH_SOURCE[0]}")/lib.sh"
+# shellcheck source=utils/brand.env
+source "${REPO_ROOT}/utils/brand.env"
 
 # ----------------------------------------------------------------------------
 # config
 # ----------------------------------------------------------------------------
 
+PUBLIC_URL="${PUBLIC_URL:-${SEARXNG_URL}}"
+
 FILTRON_ETC="/etc/filtron"
 
 SERVICE_NAME="filtron"
@@ -25,13 +29,16 @@ usage() {
     # shellcheck disable=SC1117
     cat <<EOF
 usage::
-  $(basename "$0") remove all]
+  $(basename "$0") remove all
   $(basename "$0") apache remove
   $(basename "$0") nginx  remove
 
 remove all     : drop all components of the filtron service
 apache remove  : drop apache site ${APACHE_FILTRON_SITE}
 nginx  remove  : drop nginx site ${NGINX_FILTRON_SITE}
+
+environment:
+  PUBLIC_URL   : ${PUBLIC_URL}
 EOF
 
     [[ -n ${1} ]] &&  err_msg "$1"
diff --git a/utils/morty.sh b/utils/morty.sh
index a85b04bb8..33c5c0e73 100755
--- a/utils/morty.sh
+++ b/utils/morty.sh
@@ -3,11 +3,15 @@
 
 # shellcheck source=utils/lib.sh
 source "$(dirname "${BASH_SOURCE[0]}")/lib.sh"
+# shellcheck source=utils/brand.env
+source "${REPO_ROOT}/utils/brand.env"
 
 # ----------------------------------------------------------------------------
 # config
 # ----------------------------------------------------------------------------
 
+PUBLIC_URL="${PUBLIC_URL:-${SEARXNG_URL}}"
+
 MORTY_LISTEN="${MORTY_LISTEN:-127.0.0.1:3000}"
 PUBLIC_URL_PATH_MORTY="${PUBLIC_URL_PATH_MORTY:-/morty/}"
 PUBLIC_URL_MORTY="${PUBLIC_URL_MORTY:-$(echo "$PUBLIC_URL" |  sed -e's,^\(.*://[^/]*\).*,\1,g')${PUBLIC_URL_PATH_MORTY}}"
@@ -35,6 +39,9 @@ usage::
 remove all     : drop all components of the morty service
 apache remove  : drop apache site ${APACHE_MORTY_SITE}
 nginx  remove  : drop nginx site ${NGINX_MORTY_SITE}
+
+environment:
+  PUBLIC_URL_MORTY   : ${PUBLIC_URL_MORTY}
 EOF
 
     [[ -n ${1} ]] &&  err_msg "$1"
diff --git a/utils/searx.sh b/utils/searx.sh
index 2f5e98c8e..5473c11c4 100755
--- a/utils/searx.sh
+++ b/utils/searx.sh
@@ -4,11 +4,15 @@
 
 # shellcheck source=utils/lib.sh
 source "$(dirname "${BASH_SOURCE[0]}")/lib.sh"
+# shellcheck source=utils/brand.env
+source "${REPO_ROOT}/utils/brand.env"
 
 # ----------------------------------------------------------------------------
 # config
 # ----------------------------------------------------------------------------
 
+PUBLIC_URL="${PUBLIC_URL:-${SEARXNG_URL}}"
+
 SERVICE_NAME="searx"
 SERVICE_USER="${SERVICE_USER:-${SERVICE_NAME}}"
 SEARXNG_SETTINGS_PATH="/etc/searx/settings.yml"
@@ -24,6 +28,9 @@ usage::
   $(basename "$0") remove     all
 
 remove all:    complete uninstall of SearXNG service
+
+environment:
+  PUBLIC_URL   : ${PUBLIC_URL}
 EOF
 
     [[ -n ${1} ]] &&  err_msg "$1"