diff --git a/cd.sh b/cd.sh
index 75c9379..a8a9701 100644
--- a/cd.sh
+++ b/cd.sh
@@ -5,11 +5,8 @@ CD_DEFAULT_DNS="\
 9.9.9.9 \
 "
 
-CD_GIT_CHILD="cd"
-CD_PYTHON_MODULES="\
-${CD_GIT_CHILD} \
-rwx \
-"
+[ "${CD_GIT_CHILD}" ] || CD_GIT_CHILD="cd"
+[ "${CD_GIT_PARENT}" ] || CD_GIT_PARENT="rwx"
 
 # main
 cd_main () {
@@ -540,7 +537,7 @@ local url
     cd_step "Install Python modules"
     root="$(mktemp --directory)" || exit
     echo "${root}"
-    for repository in ${CD_PYTHON_MODULES} ; do
+    for repository in "${CD_GIT_CHILD}" "${CD_GIT_PARENT}" ; do
         cd_split
         url="${CD_PROJECTS_URL}/${repository}"
         echo -n "\