diff --git a/app/views/administration_mailer/invite_admin.html.haml b/app/views/administration_mailer/invite_admin.html.haml
index dfbf0cb3c..49be915cd 100644
--- a/app/views/administration_mailer/invite_admin.html.haml
+++ b/app/views/administration_mailer/invite_admin.html.haml
@@ -16,7 +16,7 @@ Vous pouvez me joindre au numéro suivant : 01 76 42 02 87.
 %br
 %br
 Je vous invite également à consulter notre site de documentation qui regroupe l'ensemble des informations relatives à demarches-simplifiees.fr ainsi que des tutoriels d’utilisation :
-= link_to('https://demarches-simplifiees.gitbook.io/demarches-simplifiees/', 'https://demarches-simplifiees.gitbook.io/demarches-simplifiees/')
+= link_to(DOC_URL, DOC_URL)
 %br
 %br
 = render partial: "layouts/mailers/bizdev_signature"
diff --git a/app/views/gestionnaire_mailer/invite_gestionnaire.html.haml b/app/views/gestionnaire_mailer/invite_gestionnaire.html.haml
index 3b5fa28d3..56d39d440 100644
--- a/app/views/gestionnaire_mailer/invite_gestionnaire.html.haml
+++ b/app/views/gestionnaire_mailer/invite_gestionnaire.html.haml
@@ -10,7 +10,7 @@ Votre compte a été créé pour l'adresse email #{@gestionnaire.email}. Pour l
 %br
 %br
 Par ailleurs, notre site de documentation qui regroupe l'ensemble des informations relatives à demarches-simplifiees.fr ainsi que des tutoriels d’utilisation est à votre disposition : 
-= link_to('https://demarches-simplifiees.gitbook.io/demarches-simplifiees/', 'https://demarches-simplifiees.gitbook.io/demarches-simplifiees/')
+= link_to(DOC_URL, DOC_URL)
 %br
 %br
 Bonne journée,
diff --git a/app/views/layouts/_new_footer.html.haml b/app/views/layouts/_new_footer.html.haml
index 264c5c331..462609955 100644
--- a/app/views/layouts/_new_footer.html.haml
+++ b/app/views/layouts/_new_footer.html.haml
@@ -24,7 +24,7 @@
           %li.footer-link
             = link_to "CGU", CGU_URL, :class => "footer-link", :target => "_blank", rel: "noopener noreferrer"
           %li.footer-link
-            = link_to "Mentions légales", "https://demarches-simplifiees.gitbook.io/demarches-simplifiees/cgu#4.-mentions-legales",  :class => "footer-link", :target => "_blank", rel: "noopener noreferrer"
+            = link_to "Mentions légales", MENTIONS_LEGALES_URL,  :class => "footer-link", :target => "_blank", rel: "noopener noreferrer"
 
       %li.footer-column
         %ul.footer-links
@@ -33,10 +33,10 @@
               "mailto:#{t('dynamics.contact_email')}",
               :class => "footer-link"
           %li.footer-link
-            = link_to "Documentation", "https://demarches-simplifiees.gitbook.io/demarches-simplifiees/", :class => "footer-link", :target => "_blank", rel: "noopener noreferrer"
+            = link_to "Documentation", DOC_URL, :class => "footer-link", :target => "_blank", rel: "noopener noreferrer"
           %li.footer-link
             = link_to "Documentation de l'API", "/docs", :class => "footer-link", :target => "_blank", rel: "noopener noreferrer"
           %li.footer-link
-            = link_to "FAQ", "http://demarches-simplifiees.helpscoutdocs.com/", :class => "footer-link", :target => "_blank", rel: "noopener noreferrer"
+            = link_to "FAQ", FAQ_URL, :class => "footer-link", :target => "_blank", rel: "noopener noreferrer"
           %li.footer-link
             = link_to "Accessibilité", accessibilite_index_path, :class => "footer-link"
diff --git a/app/views/root/landing.html.haml b/app/views/root/landing.html.haml
index f208b0a79..f518b3086 100644
--- a/app/views/root/landing.html.haml
+++ b/app/views/root/landing.html.haml
@@ -51,7 +51,7 @@
             class: "role-panel-button-primary"
 
           = link_to "Voir les démarches disponibles",
-            "https://demarches-simplifiees.gitbook.io/demarches-simplifiees/listes-des-demarches",
+            LISTE_DES_DEMARCHES_URL,
             target: "_blank",
             rel: "noopener noreferrer",
             class: "role-panel-button-secondary"
@@ -74,7 +74,7 @@
             onclick: "javascript: ga('send', 'pageview', '/demander-une-demo')"
 
           = link_to "Voir la documentation",
-            "https://demarches-simplifiees.gitbook.io/demarches-simplifiees/",
+            DOC_URL,
             target: "_blank",
             rel: "noopener noreferrer",
             class: "role-panel-button-secondary"
diff --git a/config/initializers/constants.rb b/config/initializers/constants.rb
index 95da3f7ed..a1408744f 100644
--- a/config/initializers/constants.rb
+++ b/config/initializers/constants.rb
@@ -1 +1,6 @@
-CGU_URL = "https://demarches-simplifiees.gitbook.io/demarches-simplifiees/cgu"
+DOC_URL = "https://doc.demarches-simplifiees.fr"
+LISTE_DES_DEMARCHES_URL = [DOC_URL, "listes-des-demarches"].join("/")
+CGU_URL = [DOC_URL, "cgu"].join("/")
+MENTIONS_LEGALES_URL = [CGU_URL, "4-mentions-legales"].join("#")
+
+FAQ_URL = "https://faq.demarches-simplifiees.fr"