diff --git a/Doc/library/importlib.rst b/Doc/library/importlib.rst
index 300653a..008df09 100644
--- a/Doc/library/importlib.rst
+++ b/Doc/library/importlib.rst
@@ -248,7 +248,8 @@
     .. method:: set_data(self, path, data)
 
         Optional abstract method which writes the specified bytes to a file
-        path.
+        path. When writing to the path fails because the path is read-only, do
+        not propagate the exception.
 
     .. method:: get_code(self, fullname)