Traverse record declarations and generate typed field accessors

README.md

@@ -2,6 +2,9 @@
 
 Lenses for reading and updating immutable data in OCaml.
 
+Annotate a record with `[@@fieldglass generate]` to generate field accessors.
+The `[@@lens generate]` spelling is also accepted.
+
 Build with `make`; run the checks with `make test`.
 
 The `_hd` and `_tl` lenses raise `Invalid_argument` on empty lists.