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diff --git a/dhall/src/errors/InvalidOptionalElement.txt b/dhall/src/errors/InvalidOptionalElement.txt
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+Explanation: An ❰Optional❱ element must have a type matching the type annotation
+
+For example, this is a valid ❰Optional❱ value:
+
+
+    ┌────────────────────────┐
+    │ [1] : Optional Integer │  ❰1❱ is an ❰Integer❱, which matches the type
+    └────────────────────────┘
+
+
+... but this is $_NOT a valid ❰Optional❱ value:
+
+
+    ┌────────────────────────────┐
+    │ ["ABC"] : Optional Integer │  ❰"ABC"❱ is not an ❰Integer❱
+    └────────────────────────────┘
+
+
+Your ❰Optional❱ element should have this type:
+
+↳ $txt0
+
+... but the element you provided:
+
+↳ $txt1
+
+... has this type instead:
+
+↳ $txt2