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diff --git a/compiler/rustc_error_codes/src/error_codes/E0761.md b/compiler/rustc_error_codes/src/error_codes/E0761.md
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@@ -0,0 +1,21 @@
+Multiple candidate files were found for an out-of-line module.
+
+Erroneous code example:
+
+```ignore (Multiple source files are required for compile_fail.)
+// file: ambiguous_module/mod.rs
+
+fn foo() {}
+
+// file: ambiguous_module.rs
+
+fn foo() {}
+
+// file: lib.rs
+
+mod ambiguous_module; // error: file for module `ambiguous_module`
+                      // found at both ambiguous_module.rs and
+                      // ambiguous_module.rs/mod.rs
+```
+
+Please remove this ambiguity by deleting/renaming one of the candidate files.