diff --git a/src/librustc_error_codes/error_codes/E0724.md b/src/librustc_error_codes/error_codes/E0724.md
index 7a7ba15485434..e8f84d0fc7d50 100644
--- a/src/librustc_error_codes/error_codes/E0724.md
+++ b/src/librustc_error_codes/error_codes/E0724.md
@@ -1,4 +1,5 @@
-`#[ffi_returns_twice]` was used on non-foreign function.
+`#[ffi_returns_twice]` was used on something other than a foreign function
+declaration.
 
 Erroneous code example: