diff --git a/frontend/src/features/documents/components/DocumentForm.tsx b/frontend/src/features/documents/components/DocumentForm.tsx
index 3af4775..f2ed139 100644
--- a/frontend/src/features/documents/components/DocumentForm.tsx
+++ b/frontend/src/features/documents/components/DocumentForm.tsx
@@ -31,8 +31,8 @@ export const DocumentForm: React.FC<DocumentFormProps> = ({
   onSuccess,
   onCancel
 }) => {
-  const [documentType, setDocumentType] = React.useState<DocumentType>(
-    initialValues?.documentType || 'insurance'
+  const [documentType, setDocumentType] = React.useState<DocumentType | ''>(
+    initialValues?.documentType || ''
   );
   const [vehicleID, setVehicleID] = React.useState<string>(initialValues?.vehicleId || '');
   const [title, setTitle] = React.useState<string>(initialValues?.title || '');
@@ -152,6 +152,10 @@ export const DocumentForm: React.FC<DocumentFormProps> = ({
       setError('Please select a vehicle.');
       return;
     }
+    if (!documentType) {
+      setError('Please select a document type.');
+      return;
+    }
     if (!title.trim()) {
       setError('Please enter a title.');
       return;
@@ -337,7 +341,9 @@ export const DocumentForm: React.FC<DocumentFormProps> = ({
             value={documentType}
             onChange={(e) => setDocumentType(e.target.value as DocumentType)}
             disabled={mode === 'edit'}
+            required
           >
+            <option value="" disabled>Select a document type...</option>
             <option value="insurance">Insurance</option>
             <option value="registration">Registration</option>
             <option value="manual">Manual</option>