diff --git a/docs/changelog.rst b/docs/changelog.rst
index 9c0f1ae..9a0b828 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -10,6 +10,7 @@ Changelog
  * code cleaning by Bram
  * make code a bit more robust by Bram
  * basic CI on travis by Bram
+ * Light mode by beudbeud
 
 0.3.1 (2016-04-13)
 
diff --git a/docs/configuration.rst b/docs/configuration.rst
index f1fdc5e..94975ed 100644
--- a/docs/configuration.rst
+++ b/docs/configuration.rst
@@ -120,6 +120,16 @@ To specify the theme, add the "theme" key in your "settings" key or your
     settings:
       theme: material
 
+Light mode
+~~~~~~~~~~
+
+Prosopopée has a support light mode, for all gallery you need add /light on the url.
+When this mode is enable Prosopopée build the gallery with light theme (no Js and pics size is 800px)::
+
+    settings:
+      light_mode: true    
+
+
 Licence
 ~~~~~~~