-
-We must do some gentle simplification on the template (but not the RHS)
-of each rule. The case that forced me to add this was the fold/build rule,
+Note [Simplifying the left-hand side of a RULE]
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+We must do some gentle simplification on the lhs (template) of each
+rule. The case that forced me to add this was the fold/build rule,