diff --git a/docs/index.rst b/docs/index.rst
index c8e4f15..589de09 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -198,7 +198,7 @@ You can define fieldsets to group settings together:
 Fieldsets collapsing
 --------------------
 
-To make some fieldsets collapsing you can use new format if CONSTANCE_CONFIG_FIELDSETS. Here's an example:
+To make some fieldsets collapsing you can use new format in CONSTANCE_CONFIG_FIELDSETS. Here's an example:
 
 .. code-block:: python