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diff --git a/compiler/rustc_error_codes/src/error_codes/E0426.md b/compiler/rustc_error_codes/src/error_codes/E0426.md
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+An undeclared label was used.
+
+Erroneous code example:
+
+```compile_fail,E0426
+loop {
+    break 'a; // error: use of undeclared label `'a`
+}
+```
+
+Please verify you spelled or declared the label correctly. Example:
+
+```
+'a: loop {
+    break 'a; // ok!
+}
+```