diff --git a/scsh/select1.c b/scsh/select1.c
index b790ee2..2aa20c3 100644
--- a/scsh/select1.c
+++ b/scsh/select1.c
@@ -136,6 +136,7 @@ int do_select(scheme_value rvec, scheme_value wvec,
 	}
     else tptr = NULL;				/* #f => Infinite wait. */
 
+    /* select1() is defined in sysdep.h -- bogus compatibility macro. */
     nfound = select1(max_fd+1, rset_ans, wset_ans, eset_ans, tptr); /* Do it.*/
 
     /* EINTR is not an error return if we have hits on buffered ports