diff --git a/docs/sections.rst b/docs/sections.rst
index e219b99..d3c4384 100644
--- a/docs/sections.rst
+++ b/docs/sections.rst
@@ -46,6 +46,12 @@ Without text::
   - type: full-picture
     image: big_picture.jpg
 
+  
+If you want fixed backgroup use can use this optionnal option (only with the exposure theme)::
+
+  - type: full-picture
+    fixed: true
+
 Bordered picture
 ________________
 
diff --git a/prosopopee/themes/exposure/templates/sections/full-picture.html b/prosopopee/themes/exposure/templates/sections/full-picture.html
index 656d44d..7b88dc8 100644
--- a/prosopopee/themes/exposure/templates/sections/full-picture.html
+++ b/prosopopee/themes/exposure/templates/sections/full-picture.html
@@ -26,7 +26,7 @@
 {% else %}
 {% set image = Image(section.image) %}
 {{ image.copy() }}
-<section class="full-picture" style="background: url('{{ image.generate_thumbnail("x2000") }}') no-repeat fixed center top / cover, url('{{ image.generate_thumbnail("x450") }}') no-repeat fixed center top / cover transparent;">
+<section class="full-picture" style="background: url('{{ image.generate_thumbnail("x2000") }}') no-repeat {% if section.fixed %} fixed {% else %} scroll {% endif %} center top / cover, url('{{ image.generate_thumbnail("x450") }}') no-repeat {% if section.fixed %} fixed {% else %} scroll {% endif %} center top / cover transparent;">
   {% if section.text %}
   <div class="picture-text">
     <div class="picture-text-column">