diff --git a/doc/users/user_ref.rst b/doc/users/user_ref.rst
index 0f6ed3435..eab00a744 100644
--- a/doc/users/user_ref.rst
+++ b/doc/users/user_ref.rst
@@ -483,7 +483,7 @@ User input reference
   
     **Type** ``float``
   
-    **Default** ``0.6``
+    **Default** ``0.5``
   
  :ExternalFields: Define external electromagnetic fields. 
 
@@ -12254,4 +12254,4 @@ User input reference
         **Type** ``float``
       
         **Default** ``0.00011186082063``
-      
\ No newline at end of file
+