diff --git a/source/applications/aggregation.txt b/source/applications/aggregation.txt
index dab3b405fa9..5b02ebbab65 100644
--- a/source/applications/aggregation.txt
+++ b/source/applications/aggregation.txt
@@ -63,7 +63,7 @@ through the pipeline.
 
 .. warning::
 
-   The pipeline cannot operate on collects with documents that contain
+   The pipeline cannot operate on collections with documents that contain
    one of the following "special fields:" ``MinKey``, ``MaxKey``,
    ``EOO``, ``Undefined``, ``DBRef``, ``Code``.