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 ### Changes affecting backwards compatibility
 
+- All `strutils.rfind` procs now take `start` and `last` like `strutils.find`
+  with the same data slice/index meaning.  This is backwards compatible for
+  calls *not* changing the `rfind` `start` parameter from its default.
+
+  In the unlikely case that you were using `rfind X, start=N`, or `rfind X, N`,
+  then you need to change that to `rfind X, last=N` or `rfind X, 0, N`. (This
+  should minimize gotchas porting code from other languages like Python or C++.)
 
 #### Breaking changes in the standard library