diff --git a/docs/4.0/components/input-group.md b/docs/4.0/components/input-group.md
index 144d6f6284..ec1626b74a 100644
--- a/docs/4.0/components/input-group.md
+++ b/docs/4.0/components/input-group.md
@@ -8,7 +8,7 @@ toc: true
 
 ## Basic example
 
-Place one add-on or button on either side of an input. You may also place one on both sides of an input. **We do not support multiple form-controls in a single input group.**
+Place one add-on or button on either side of an input. You may also place one on both sides of an input. **We do not support multiple form-controls in a single input group** and `<label>`s must come outside the input group.
 
 {% example html %}
 <div class="input-group">