diff --git a/paths/patient_base.yaml b/paths/patient_base.yaml
index aed1069..e781511 100644
--- a/paths/patient_base.yaml
+++ b/paths/patient_base.yaml
@@ -8,6 +8,7 @@ get:
       description: |-
         The AGB code (dutch: _Algemeen Gegevens Beheer_ - unique identifier for medical professionals and GP practices) of the GP practice
         whose patient population should be searched.
+      required: true
     - name: bsn
       in: query
       description: |-
diff --git a/paths/patient_dossier.yaml b/paths/patient_dossier.yaml
index fe23ea0..8d29b5f 100644
--- a/paths/patient_dossier.yaml
+++ b/paths/patient_dossier.yaml
@@ -18,6 +18,7 @@ get:
       description: |-
         The AGB code (dutch: _Algemeen Gegevens Beheer_ - unique identifier for medical professionals and GP practices) of the GP practice
         whose patient population should be searched.
+      required: true
     - name: bsn
       in: query
       description: |-