diff --git a/flaskinventory/main/model.py b/flaskinventory/main/model.py
index 4a63a61f..1f99681f 100644
--- a/flaskinventory/main/model.py
+++ b/flaskinventory/main/model.py
@@ -886,8 +886,10 @@ class Tool(Entry):
                                         autoload_choices=True,
                                         relationship_constraint="FileFormat")
 
-    author_validated = Boolean(description="Do the authors of the tool report any validation?",
-                                label="Yes, validation is reported")
+    author_validated = SingleChoice(description="Do the authors of the tool report any validation?",
+                                choices={'na': 'NA / Unknown',
+                                        'yes': 'Yes',
+                                        'no': 'No, not reported'})
 
     validation_corpus = ListRelationship(description="Which corpus was used to validate the tool?",
                                             autoload_choices=True,
diff --git a/flaskinventory/templates/view/elements/tool/about.html b/flaskinventory/templates/view/elements/tool/about.html
index 8312a25e..965ad584 100644
--- a/flaskinventory/templates/view/elements/tool/about.html
+++ b/flaskinventory/templates/view/elements/tool/about.html
@@ -72,14 +72,12 @@
             {{ render_tags(entry.output_file_format) }}
         </dd>
         {% endif %}
+        {% if entry.author_validated %}
         <dt class="col-sm-3">Author(s) reported validation</dt>
         <dd class="col-sm-9">
-            {% if entry.author_validated %}
-                <span>Yes</span>
-            {% else %}
-                <span>No</span>
-            {% endif %}
+            <span>{{  entry.author_validated }}</span>
         </dd>
+        {% endif %}
         {% if entry.validation_corpus %}
         <dt class="col-sm-3">Corpus used for validation</dt>
         <dd class="col-sm-9">