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diff --git a/dhall/src/errors/InvalidAlterantive.txt b/dhall/src/errors/InvalidAlterantive.txt
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+Explanation: Every union type specifies the type of each alternative, like this:
+
+
+               The type of the first alternative is ❰Bool❱
+               ⇩
+    ┌──────────────────────────────────┐
+    │ < Left : Bool, Right : Natural > │  A union type with two alternatives
+    └──────────────────────────────────┘
+                             ⇧
+                             The type of the second alternative is ❰Natural❱
+
+
+However, these alternatives can only be annotated with types.  For example, the
+following union types are $_NOT valid:
+
+
+    ┌────────────────────────────┐
+    │ < Left : Bool, Right : 1 > │  Invalid union type
+    └────────────────────────────┘
+                             ⇧
+                             This is a term and not a type
+
+
+    ┌───────────────────────────────┐
+    │ < Left : Bool, Right : Type > │  Invalid union type
+    └───────────────────────────────┘
+                             ⇧
+                             This is a kind and not a type
+
+
+You provided a union type with an alternative named:
+
+↳ $txt0
+
+... annotated with the following expression which is not a type:
+
+↳ $txt1
+
+Some common reasons why you might get this error:
+
+● You accidentally typed ❰:❱ instead of ❰=❱ for a union literal with one
+  alternative:
+
+    ┌─────────────────┐
+    │ < Example : 1 > │
+    └─────────────────┘
+                ⇧
+                This could be ❰=❱ instead