diff --git a/pep-0263.txt b/pep-0263.txt
index a61b65648..bd0e158bf 100644
--- a/pep-0263.txt
+++ b/pep-0263.txt
@@ -202,6 +202,9 @@ Implementation
     input. 8-bit string input is subject to the standard procedure for
     encoding detection as described above.
 
+    If a Unicode string with a coding declaration is passed to compile(),
+    a SyntaxError will be raised.
+
     SUZUKI Hisao is working on a patch; see [2] for details. A patch
     implementing only phase 1 is available at [1].