===================================================================
RCS file: /cvs/mandoc/regress/mdoc/Mt/simple.out_lint,v
retrieving revision 1.3
retrieving revision 1.4
diff -u -p -r1.3 -r1.4
--- mandoc/regress/mdoc/Mt/simple.out_lint	2017/06/17 22:44:52	1.3
+++ mandoc/regress/mdoc/Mt/simple.out_lint	2017/06/25 12:53:00	1.4
@@ -1,3 +1,4 @@
-mandoc: simple.in:1:5: STYLE: Mdocdate missing: Dd June
+mandoc: simple.in:3:5: BASE: operating system explicitly specified: Os OpenBSD (OpenBSD)
+mandoc: simple.in:1:5: BASE: Mdocdate missing: Dd June (OpenBSD)
 mandoc: simple.in:12:26: STYLE: no blank before trailing delimiter: Mt punctuation@localhost.
-mandoc: simple.in: STYLE: RCS id missing
+mandoc: simple.in: BASE: RCS id missing: (OpenBSD)