diff --git a/source/reference/operator/aggregation/type.txt b/source/reference/operator/aggregation/type.txt
index 276d90cd6cf..359752c7e4e 100644
--- a/source/reference/operator/aggregation/type.txt
+++ b/source/reference/operator/aggregation/type.txt
@@ -98,6 +98,9 @@ Available Types
 
 .. include:: /includes/fact-bson-types.rst
 
+If the argument is a field that is missing in the input document,
+:expression:`$type` returns the string ``"missing"``.
+
 Example
 -------