diff --git a/gum/README.md b/gum/README.md
index 2a2380534..5db6c1099 100644
--- a/gum/README.md
+++ b/gum/README.md
@@ -48,8 +48,11 @@ Other features include:
```
SITESUBTITLE = 'your site subtitle'
+
+CUSTOM_CSS = 'path to some optional css overrides file'
```
+
The following standard Pelican settings are honored:
```
diff --git a/gum/templates/base.html b/gum/templates/base.html
index 998cac0ae..3ae01d4f9 100644
--- a/gum/templates/base.html
+++ b/gum/templates/base.html
@@ -37,7 +37,9 @@
-
+ {% if CUSTOM_CSS %}
+
+ {% endif %}