Minor clarification about importlib.abc.SourceLoader.get_filename.
diff --git a/Doc/library/importlib.rst b/Doc/library/importlib.rst
index 1e0ea5e..7a2434e 100644
--- a/Doc/library/importlib.rst
+++ b/Doc/library/importlib.rst
@@ -228,7 +228,7 @@
 
     * :meth:`ResourceLoader.get_data`
     * :meth:`ExecutionLoader.get_filename`
-          Implement to only return the path to the source file; sourceless
+          Should only return the path to the source file; sourceless
           loading is not supported.
 
     The abstract methods defined by this class are to add optional bytecode