Add mention of the bs-custom-file-input plugin needed for the custom file input ...

diff --git a/site/content/docs/4.5/components/input-group.md b/site/content/docs/4.5/components/input-group.md
index e97d3362893b0558db3d3370ff8e0155026c31a6..28edd86f04f5f28ada8239989c064e1560c3fd12 100644 (file)
--- a/site/content/docs/4.5/components/input-group.md
+++ b/site/content/docs/4.5/components/input-group.md
@@ -315,6 +315,10 @@ Input groups include support for custom selects and custom file inputs. Browser
 
 ### Custom file input
 
+{{< callout info >}}
+This example uses the [custom file browser]({{< docsref "/components/forms#file-browser" >}}) component, which relies on the separate [bs-custom-file-input](https://www.npmjs.com/package/bs-custom-file-input) plugin.
+{{< /callout >}}
+
 {{< example >}}
 <div class="input-group mb-3">
   <div class="input-group-prepend">