diff --git a/index.php b/index.php
index f084fac..15f568d 100644
--- a/index.php
+++ b/index.php
@@ -77,7 +77,7 @@ include "zefixAPI.php";
 
             <!-- Firmenname -->
             <div class="mb-4">
-              <label for="firma" class="form-label">Firmenname</label>
+              <label for="firma" class="form-label">Firmenname (optional)</label>
               <div class="form-text mb-2">* kann als Platzhalter verwendet werden</div>
               <input type="text" id="firma" name="firma" class="form-control" placeholder="z.B. Silias*">
             </div>
@@ -183,6 +183,9 @@ include "zefixAPI.php";
             <div class="d-grid">
               <button type="submit" class="btn btn-primary btn-lg">Export starten</button>
             </div>
+            <div id="selectionValidationMessage" class="text-danger mt-2" style="display:none;">
+              Wählen Sie mindestens einen Ort und eine Rechtsform
+            </div>
 
           </form>
 
@@ -193,7 +196,15 @@ include "zefixAPI.php";
               const forms = document.querySelectorAll('.needs-validation')
               Array.prototype.slice.call(forms).forEach(function (form) {
                 form.addEventListener('submit', function (event) {
-                  if (!form.checkValidity()) {
+                  const hasSelectedSitz = document.querySelector('input[name="sitze[]"]:checked') !== null
+                  const hasSelectedRechtsform = document.querySelector('input[name="rechtsformen[]"]:checked') !== null
+                  const selectionValidationMessage = document.getElementById('selectionValidationMessage')
+
+                  if (selectionValidationMessage) {
+                    selectionValidationMessage.style.display = hasSelectedSitz && hasSelectedRechtsform ? 'none' : 'block'
+                  }
+
+                  if (!form.checkValidity() || !hasSelectedSitz || !hasSelectedRechtsform) {
                     event.preventDefault()
                     event.stopPropagation()
                   }
@@ -452,4 +463,4 @@ include "zefixAPI.php";
 </footer>
 
 </body>
-</html>
\ No newline at end of file
+</html>