diff --git a/docs/reference/search/request/sort.asciidoc b/docs/reference/search/request/sort.asciidoc
index d3bbe283a2d..5a7c3a51f01 100644
--- a/docs/reference/search/request/sort.asciidoc
+++ b/docs/reference/search/request/sort.asciidoc
@@ -243,8 +243,20 @@ GET /_search
 
     How to compute the distance. Can either be `sloppy_arc` (default), `arc` (slightly more precise but significantly slower) or `plane` (faster, but inaccurate on long distances and close to the poles).
 
-Note: the geo distance sorting supports `sort_mode` options: `min`,
-`max` and `avg`.
+`sort_mode`::
+
+    What to do in case a field has several geo points. By default, the shortest
+    distance is taken into account when sorting in ascending order and the
+    longest distance when sorting in descending order. Supported values are
+    `min`, `max`, `median` and `avg`.
+
+`unit`::
+
+    The unit to use when computing sort values. The default is `m` (meters).
+
+NOTE: geo distance sorting does not support configurable missing values: the
+distance will always be considered equal to +Infinity+ when a document does not
+have values for the field that is used for distance computation.
 
 The following formats are supported in providing the coordinates: