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diff --git a/compiler/rustc_error_codes/src/error_codes/E0415.md b/compiler/rustc_error_codes/src/error_codes/E0415.md
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+More than one function parameter have the same name.
+
+Erroneous code example:
+
+```compile_fail,E0415
+fn foo(f: i32, f: i32) {} // error: identifier `f` is bound more than
+                          //        once in this parameter list
+```
+
+Please verify you didn't misspell parameters' name. Example:
+
+```
+fn foo(f: i32, g: i32) {} // ok!
+```