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diff --git a/compiler/rustc_error_codes/src/error_codes/E0516.md b/compiler/rustc_error_codes/src/error_codes/E0516.md
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+The `typeof` keyword is currently reserved but unimplemented.
+
+Erroneous code example:
+
+```compile_fail,E0516
+fn main() {
+    let x: typeof(92) = 92;
+}
+```
+
+Try using type inference instead. Example:
+
+```
+fn main() {
+    let x = 92;
+}
+```