diff --git a/app/components/editable_champ/rnf_component/rnf_component.en.yml b/app/components/editable_champ/rnf_component/rnf_component.en.yml
index 24faeae48..5221ee0d0 100644
--- a/app/components/editable_champ/rnf_component/rnf_component.en.yml
+++ b/app/components/editable_champ/rnf_component/rnf_component.en.yml
@@ -2,4 +2,4 @@
 en:
   rnf_info_error: No foundation found
   rnf_info_pending: RNF verification pending
-  rnf_info_success: "This RNF matches %{title}, %{address}"
+  rnf_info_success: "This RNF matches: %{title}, %{address}"
diff --git a/app/components/editable_champ/rnf_component/rnf_component.fr.yml b/app/components/editable_champ/rnf_component/rnf_component.fr.yml
index 6c1441985..0a334be79 100644
--- a/app/components/editable_champ/rnf_component/rnf_component.fr.yml
+++ b/app/components/editable_champ/rnf_component/rnf_component.fr.yml
@@ -2,4 +2,4 @@
 fr:
   rnf_info_error: Aucune fondation trouvée
   rnf_info_pending: Vérification du RNF en cours
-  rnf_info_success: "Ce RNF correspond à %{title}, %{address}"
+  rnf_info_success: "Ce RNF correspond à : %{title}, %{address}"
diff --git a/app/components/editable_champ/rnf_component/rnf_component.html.haml b/app/components/editable_champ/rnf_component/rnf_component.html.haml
index c8685d8ca..ea5da960c 100644
--- a/app/components/editable_champ/rnf_component/rnf_component.html.haml
+++ b/app/components/editable_champ/rnf_component/rnf_component.html.haml
@@ -1,6 +1,6 @@
-= @form.text_field :external_id, input_opts(id: @champ.input_id, required: @champ.required?, class: "width-33-desktop fr-input small-margin", aria: { describedby: @champ.describedby_id })
+= @form.text_field :external_id, input_opts(id: @champ.input_id, required: @champ.required?, class: "width-33-desktop fr-input", aria: { describedby: @champ.describedby_id })
 
-.rnf-info{ id: dom_id(@champ, :rnf_info) }
+.rnf-info{ id: dom_id(@champ, :rnf_info), role: 'status' }
   - if @champ.fetch_external_data_error?
     %p.fr-error-text= t('.rnf_info_error')
   - elsif @champ.fetch_external_data_pending?
diff --git a/app/views/shared/champs/rna/_association.html.haml b/app/views/shared/champs/rna/_association.html.haml
index f0520db90..9fae5d37e 100644
--- a/app/views/shared/champs/rna/_association.html.haml
+++ b/app/views/shared/champs/rna/_association.html.haml
@@ -1,7 +1,6 @@
 - case error
 - when :invalid
-  %p.fr-error-text
-    Le numéro RNA doit commencer par un W majuscule suivi de 9 chiffres ou lettres
+  %p.fr-error-text= t('.invalid_number')
 - when :not_found
   %p.fr-error-text= t('.not_found')
 - when :network_error
diff --git a/config/locales/models/champs/rnf_champ/en.yml b/config/locales/models/champs/rnf_champ/en.yml
index 8050acc4b..7b65475ef 100644
--- a/config/locales/models/champs/rnf_champ/en.yml
+++ b/config/locales/models/champs/rnf_champ/en.yml
@@ -18,4 +18,4 @@ en:
     attributes:
       champs/rnf_champ:
           hints:
-            value: "Expected format : 075-FDD-00003-01"
+            value_html: "Expected format: <span aria-hidden='true'>075-FDD-00003-01</span> <span class='sr-only'>075 hyphen FDD hyphen 00003 hyphen 01</span>"
diff --git a/config/locales/models/champs/rnf_champ/fr.yml b/config/locales/models/champs/rnf_champ/fr.yml
index a847d6e52..7d95e7f71 100644
--- a/config/locales/models/champs/rnf_champ/fr.yml
+++ b/config/locales/models/champs/rnf_champ/fr.yml
@@ -18,4 +18,4 @@ fr:
     attributes:
       champs/rnf_champ:
           hints:
-            value: "Format attendu : 075-FDD-00003-01"
+            value_html: "Format attendu : <span aria-hidden='true'>075-FDD-00003-01</span> <span class='sr-only'>075 tiret FDD tiret 00003 tiret 01</span>"
diff --git a/config/locales/shared.en.yml b/config/locales/shared.en.yml
index 044deec35..8f057684d 100644
--- a/config/locales/shared.en.yml
+++ b/config/locales/shared.en.yml
@@ -28,9 +28,10 @@ en:
           not_filled: not filled
           not_found: "RNA number %{rna} (no association found)"
         association:
-          data_fetched: "This RNA number is linked to %{title}, %{address}"
+          data_fetched: "This RNA number is linked to: %{title}, %{address}"
           not_found: "No association found"
           network_error: "A network error has prevented the association associated with this RNA to be fetched"
+          invalid_number: "The RNA number must begin with a capital W followed by 9 digits or letters"
       rnf:
         show:
           not_found: "RNF %{rnf} (no foundation found)"
diff --git a/config/locales/shared.fr.yml b/config/locales/shared.fr.yml
index fbca54f2d..968309730 100644
--- a/config/locales/shared.fr.yml
+++ b/config/locales/shared.fr.yml
@@ -30,9 +30,10 @@ fr:
           not_filled: non renseigné
           not_found: "RNA %{rna} (aucun établissement trouvé)"
         association:
-          data_fetched: "Ce RNA correspond à %{title}, %{address}"
+          data_fetched: "Ce RNA correspond à : %{title}, %{address}"
           not_found: "Aucun établissement trouvé"
           network_error: "Une erreur réseau a empêché l’association liée à ce RNA d’être trouvée"
+          invalid_number: "Le numéro RNA doit commencer par un W majuscule suivi de 9 chiffres ou lettres"
       rnf:
         show:
           not_found: "RNF %{rnf} (aucune fondation trouvée)"