diff --git a/nateman/templates/klausuren/add.html.j2 b/nateman/templates/klausuren/add.html.j2
index 59505bf..10348d4 100644
--- a/nateman/templates/klausuren/add.html.j2
+++ b/nateman/templates/klausuren/add.html.j2
@@ -63,11 +63,11 @@
     <div>
       <div>Klausurzeitraum:</div>
       <div>
-            <input type="number" name="startperiod" id="startperiod-input" class="small" min="0" max="2147483647"
-                   required>{#
+            <input type="number" name="startperiod" id="startperiod-input" class="small" aria-label="erste Stunde"
+                   min="0" max="2147483647" required>{#
             #}. bis
-            <input type="number" name="endperiod" id="endperiod-input" class="small" min="0" max="2147483647"
-                   required>{#
+            <input type="number" name="endperiod" id="endperiod-input" class="small" aria-label="letzte Stunde"
+                   min="0" max="2147483647" required>{#
             #}. Stunde
           </div>
     </div>
diff --git a/nateman/templates/klausuren/edit.html.j2 b/nateman/templates/klausuren/edit.html.j2
index 38f3da7..7a32246 100644
--- a/nateman/templates/klausuren/edit.html.j2
+++ b/nateman/templates/klausuren/edit.html.j2
@@ -293,11 +293,11 @@
         <div>
           <div>Klausurzeitraum:</div>
           <div>
-            <input type="number" name="new-startperiod" id="new-startperiod-input" class="small" min="0"
-                   max="2147483647" value="{{ klausur.startperiod }}" required>{#
+            <input type="number" name="new-startperiod" id="new-startperiod-input" aria-label="erste Stunde"
+                   class="small" min="0" max="2147483647" value="{{ klausur.startperiod }}" required>{#
             #}. bis
-            <input type="number" name="new-endperiod" id="new-endperiod-input" class="small" min="0" max="2147483647"
-                   value="{{ klausur.endperiod }}" required>{#
+            <input type="number" name="new-endperiod" id="new-endperiod-input" class="small" aria-label="letzte Stunde"
+                   min="0" max="2147483647" value="{{ klausur.endperiod }}" required>{#
             #}. Stunde
           </div>
         </div>
diff --git a/nateman/templates/schueler/versaeumnisse.html.j2 b/nateman/templates/schueler/versaeumnisse.html.j2
index 5861936..c1691f4 100644
--- a/nateman/templates/schueler/versaeumnisse.html.j2
+++ b/nateman/templates/schueler/versaeumnisse.html.j2
@@ -91,11 +91,11 @@
                   </td>
                   <td class="first-in-category">
                     <input type="checkbox" name="a_{{ kt.klausur.id }}:{{ kt.schueler.id }}"
-                           {% if kt.attestiert %}checked{% endif %}>
+                           aria-label="attestiert" {% if kt.attestiert %}checked{% endif %}>
                   </td>
                   <td>
                     <input type="checkbox" name="n_{{ kt.klausur.id }}:{{ kt.schueler.id }}"
-                           {% if kt.nachgeschrieben %}checked{% endif %}>
+                           aria-label="nachgeschrieben" {% if kt.nachgeschrieben %}checked{% endif %}>
                   </td>
                 </tr>
               {% endfor %}