diff --git a/Documentation/rest-api-changes.txt b/Documentation/rest-api-changes.txt
index 4f85d3a..4434c2e 100644
--- a/Documentation/rest-api-changes.txt
+++ b/Documentation/rest-api-changes.txt
@@ -4802,10 +4802,12 @@
 finding a file by partial name.  Clients that also need the FileInfo
 should make two requests.
 
-The integer-valued request parameter `parent` changes the response to return a
-map of the files which are different in this commit compared to the given
-parent commit. This is useful for supporting review of merge commits.  The value
-is the 1-based index of the parent's position in the commit object.
+For merge commits only, the integer-valued request parameter `parent`
+changes the response to return a map of the files which are different
+in this commit compared to the given parent commit. The value is the
+1-based index of the parent's position in the commit object. If not
+specified, the response contains a map of the files different in the
+auto merge result.
 
 The request parameter `base` changes the response to return a map of the
 files which are different in this commit compared to the given revision. The