diff --git a/docs/_includes/customizer-variables.html b/docs/_includes/customizer-variables.html
index 89fb39dec8..d03c3e6e82 100644
--- a/docs/_includes/customizer-variables.html
+++ b/docs/_includes/customizer-variables.html
@@ -1143,6 +1143,10 @@
     <label for="input-@modal-lg">@modal-lg</label>
     <input id="input-@modal-lg" type="text" value="900px" data-var="@modal-lg" class="form-control"/>
   </div>
+  <div class="bs-customizer-input">
+    <label for="input-@modal-md">@modal-md</label>
+    <input id="input-@modal-md" type="text" value="600px" data-var="@modal-md" class="form-control"/>
+  </div>
   <div class="bs-customizer-input">
     <label for="input-@modal-sm">@modal-sm</label>
     <input id="input-@modal-sm" type="text" value="300px" data-var="@modal-sm" class="form-control"/>