diff --git a/User-Manual%3A-Chapter-2.md b/User-Manual%3A-Chapter-2.md
index ea21370..15fe00b 100644
--- a/User-Manual%3A-Chapter-2.md
+++ b/User-Manual%3A-Chapter-2.md
@@ -16,7 +16,7 @@ When creating an object, or when clicking on it on the object list, you open the
 
 This dialog contains all of the properties of the object that can be modified. Each property is updated in real time. You can drag the dialog away to see the consequences of your changes on the graph.
 
-That dialog can be closed by eitheir closing the window or clicking the "OK" button. Both these options save all changes done.
+That dialog can be closed by either closing the window or clicking the "OK" button. Both these options save all changes done.
 
 ## Type of properties
 There exists a lot of properties, but each of them are separated in different kinds.