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diff --git a/API.md b/API.md
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+++ b/API.md
@@ -1698,6 +1698,8 @@ isParent [bool](https://godoc.org/builtin#bool)
 topLayer [string](https://godoc.org/builtin#string)
 
 readOnly [bool](https://godoc.org/builtin#bool)
+
+history [[]string](#[]string)
 ### <a name="ImageHistory"></a>type ImageHistory
 
 ImageHistory describes the returned structure from ImageHistory.