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diff --git a/compiler/rustc_error_codes/src/error_codes/E0648.md b/compiler/rustc_error_codes/src/error_codes/E0648.md
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+An `export_name` attribute contains null characters (`\0`).
+
+Erroneous code example:
+
+```compile_fail,E0648
+#[export_name="\0foo"] // error: `export_name` may not contain null characters
+pub fn bar() {}
+```
+
+To fix this error, remove the null characters:
+
+```
+#[export_name="foo"] // ok!
+pub fn bar() {}
+```