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diff --git a/compiler/rustc_error_codes/src/error_codes/E0124.md b/compiler/rustc_error_codes/src/error_codes/E0124.md
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@@ -0,0 +1,19 @@
+A struct was declared with two fields having the same name.
+
+Erroneous code example:
+
+```compile_fail,E0124
+struct Foo {
+    field1: i32,
+    field1: i32, // error: field is already declared
+}
+```
+
+Please verify that the field names have been correctly spelled. Example:
+
+```
+struct Foo {
+    field1: i32,
+    field2: i32, // ok!
+}
+```