diff --git a/Documentation/Cookbook/rst/AdvancedUse.rst b/Documentation/Cookbook/rst/AdvancedUse.rst
index a52a505b4c7be749e3aa3d49bcb6e07ff5fbf6a1..b0d444cbc2a36906de22bd199836f6908b6c0820 100644
--- a/Documentation/Cookbook/rst/AdvancedUse.rst
+++ b/Documentation/Cookbook/rst/AdvancedUse.rst
@@ -3,8 +3,8 @@ Advanced Use
 
 This section describes advanced configuration options and tricks.
 
-Environment variables that affects Orfeo ToolBox
-------------------------------------------------
+Environment variables that affect Orfeo ToolBox
+-----------------------------------------------
 
 The following environment variables are parsed by Orfeo ToolBox. Note
 that they only affect default values, and that settings in extended