Update README.md

README.md

@@ -48,7 +48,7 @@ The Coq development is in folder [coq/ra/](coq/ra).
 | 2.3           | $`\lambda_{RN}`$ language      | `expr` (expressions) and `step` (reductions) | [lang.v](coq/ra/lang.v)   |
 | 3.2.1           | Base logic local assertions and invariants | `Seen` `Hist` `HInv` `PSInv` | [base/ghosts.v](coq/ra/base/ghosts.v) |
 | 3.2.1           | Base logic NA rules            | `f_read_na` `f_write_na` `f_alloc` `f_dealloc` | [base](coq/ra/base)/na_*.v  [base/alloc.v](coq/ra/base/alloc.v) [base/dealloc.v](coq/ra/base/dealloc.v) |
-| 3.2.2         | Message Passing in the base logic | `message_passing_base_spec` | [example/message_passing_base.v](coq/ra/example/message_passing_base.v) |
+| 3.2.2         | Message Passing in the base logic | `message_passing_base_spec` | [examples/message_passing_base.v](coq/ra/examples/message_passing_base.v) |
 | 4.1           | iGPS NA rules                   | `na_read` `na_write`; **fractional versions**: `na_read_frac` `na_write_frac` | [na.v](coq/ra/na.v) |
 | 4.1           | iGPS normal (*plain*) protocol rules | `GPS_PP_*` lemmas    | [gps/plain.v](coq/ra/gps/plain.v)  |
 | 4.1, Appendix C | iGPS escrows and exchanges | `exchange_*` and `escrows_*` lemmas | [escrows.v](coq/ra/escrows.v) |