diff --git a/docs/4.0/components/forms.md b/docs/4.0/components/forms.md
index 3830f5a9f..7dd9428f0 100644
--- a/docs/4.0/components/forms.md
+++ b/docs/4.0/components/forms.md
@@ -776,6 +776,17 @@ When attempting to submit, you'll see the `:invalid` and `:valid` styles applied
       </div>
     </div>
   </div>
+  <div class="form-group">
+    <div class="form-check">
+      <input class="form-check-input" type="checkbox" value="" id="invalidCheck" required>
+      <label class="form-check-label" for="invalidCheck">
+        I agree
+      </label>
+      <div class="invalid-feedback">
+        You must agree
+      </div>
+    </div>
+  </div>
   <button class="btn btn-primary" type="submit">Submit form</button>
 </form>
 
@@ -842,6 +853,14 @@ While these feedback styles cannot be styled with CSS, you can still customize t
       <input type="text" class="form-control" id="validationDefault05" placeholder="Zip" required>
     </div>
   </div>
+  <div class="form-group">
+    <div class="form-check">
+      <input class="form-check-input" type="checkbox" value="" id="invalidCheck2" required>
+      <label class="form-check-label" for="invalidCheck2">
+        I agree
+      </label>
+    </div>
+  </div>
   <button class="btn btn-primary" type="submit">Submit form</button>
 </form>
 {% endexample %}
@@ -903,7 +922,17 @@ We recommend using client side validation, but in case you require server side,
       </div>
     </div>
   </div>
-
+  <div class="form-group">
+    <div class="form-check">
+      <input class="form-check-input is-invalid" type="checkbox" value="" id="invalidCheck3" required>
+      <label class="form-check-label" for="invalidCheck3">
+        I agree
+      </label>
+      <div class="invalid-feedback">
+        You must agree
+      </div>
+    </div>
+  </div>
   <button class="btn btn-primary" type="submit">Submit form</button>
 </form>
 {% endexample %}