diff --git a/Gitlab-hook-script.md b/Gitlab-hook-script.md
index 3edc509..cb54215 100644
--- a/Gitlab-hook-script.md
+++ b/Gitlab-hook-script.md
@@ -9,22 +9,23 @@ The script pushes the challenge to the pages git defined in $REPO, waits for it
 #
 # dehydrated hook script to deploy a key to Gitlab.
 #
+# https://github.com/lukas2511/dehydrated/wiki/Gitlab-hook-script
+#
 # Add the following options to your config file:
-# TOKEN= API token, generate in Gitlab profile settings (select API access)
-# PROJECT= ID or URL-encoded path of the project (replace / with %2F)
-# REPO= path to local git repo of your pages project
+# TOKEN= # API token, generate in Gitlab profile settings (select API access)
+# PROJECT= # ID or URL-encoded path of the project (replace / with %2F)
+# REPO= # path to local git repo of your pages project
 
 . "$BASEDIR/$CONFIG"
 
 deploy_challenge() {
   DOMAIN="$1"
   TOKEN_FILENAME="$2"
-  cd "$REPO"
-  mkdir -p public/.well-known/acme-challenge
-  cp "$WELLKNOWN/$TOKEN_FILENAME" public/.well-known/acme-challenge/
-  git add public/.well-known/acme-challenge/"$TOKEN_FILENAME"
-  git commit -m "Let's Encrypt challenge"
-  git push
+  mkdir -p "$REPO/public/.well-known/acme-challenge"
+  cp "$WELLKNOWN/$TOKEN_FILENAME" "$REPO/public/.well-known/acme-challenge/"
+  git -C "$REPO" add public/.well-known/acme-challenge/"$TOKEN_FILENAME"
+  git -C "$REPO" commit -m "Let's Encrypt challenge"
+  git -C "$REPO" push
   sleep 20
   while ! curl --output /dev/null --silent --head --fail "http://$DOMAIN/.well-known/acme-challenge/$TOKEN_FILENAME"; do
     echo sleeping
@@ -34,11 +35,11 @@ deploy_challenge() {
 
 clean_challenge() {
   TOKEN_FILENAME="$2"
-  cd "$REPO"
-  git reset --hard HEAD~
-  git push --force-with-lease
+  git -C "$REPO" reset --hard HEAD~
+  git -C "$REPO" push --force-with-lease
 }
 
+# https://docs.gitlab.com/ee/api/pages_domains.html
 deploy_cert() {
   DOMAIN="$1"
   KEYFILE="$2"