diff --git a/docs/tools_to_interact_with_the_simulation_actors.rst b/docs/tools_to_interact_with_the_simulation_actors.rst
index b46f6140a..16fecf71e 100644
--- a/docs/tools_to_interact_with_the_simulation_actors.rst
+++ b/docs/tools_to_interact_with_the_simulation_actors.rst
@@ -1066,4 +1066,18 @@ Example: To kill particles in a cone of 20 degrees around x axis::
    /gate/actor/MyActor/angleFilter/setAngle                  20
    /gate/actor/MyActor/angleFilter/setDirection              1 0 0
 
+Filter on material type
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The attached volume of the actor may contains different materials. This filter is used to select particles hit different materials::
+
+   /gate/actor/[Actor Name]/addFilter                    materialFilter
+   /gate/actor/[Actor Name]/materialFilter/addMaterial   [Material Name]
+
+Example: To kill particles in the volume MyVolume that hits Water::
 
+   /gate/actor/addActor    KillActor                         MyActor
+   /gate/actor/MyActor/save                                  MyOutputFile.txt
+   /gate/actor/MyActor/attachTo                              MyVolume
+   /gate/actor/MyActor/addFilter                             materialFilter
+   /gate/actor/MyActor/materialFilter/addMaterial            Water
\ No newline at end of file