Clarify that there are some separable items.

pep-0340.txt

@@ -22,6 +22,21 @@ Introduction
     (Reliable Acquisition/Release Pairs), and PEP 325
     (Resource-Release Support for Generators).
 
+    I should clarify that there are a few separable proposals in this
+    PEP.
+
+    -  Using "continue EXPR" which calls its.__next__(EXPR) which
+       becomes the return value of a yield-expression is entirely
+       orthogonal with the rest of the PEP.
+
+    -  Similarly, using a generator to "drive" a block statement is
+       also separable; with just the definition of the block statement
+       from the PEP you could implement all the examples using a class
+       (similar to example 6, which is easily turned into a template).
+
+    But the key idea is using a generator to drive a block statement;
+    the rest is elaboration.
+
 Motivation and Summary
 
     (Thanks to Shane Hathaway -- Hi Shane!)