diff --git a/doc/grid_radius_assign.md b/doc/grid_radius_assign.md
index dab4543..52fd15c 100755
--- a/doc/grid_radius_assign.md
+++ b/doc/grid_radius_assign.md
@@ -41,7 +41,7 @@ Options
 **update_expression** :
   A list of :ref:`assignment expressions <Assignment Expressions>` to be applied to the points that satisfy the radius search. The list of values is evaluated in order.
 
-**output_name_attribut**: The name of the new attribut. [Default: radius]
+**output_name_attribut**: The name of the new attribute'. [Default: radius]
 
 **3d_search**: Search in 3d (as a ball). [Default: false]