diff --git a/docs/ref/contrib/gis/admin.txt b/docs/ref/contrib/gis/admin.txt
index 4ec10003f6..aa6ba58630 100644
--- a/docs/ref/contrib/gis/admin.txt
+++ b/docs/ref/contrib/gis/admin.txt
@@ -50,7 +50,7 @@ GeoDjango's admin site
 
    .. attribute:: modifiable
 
-   Defaults to ``False``.  When set to ``True``, disables editing of
+   Defaults to ``True``.  When set to ``False``, disables editing of
    existing geometry fields in the admin.
 
    .. note::