1 files changed, 11 insertions, 2 deletions

diff --git a/usr.bin/join/join.1 b/usr.bin/join/join.1
index fa383c6a264a..a1855cf00d37 100644
--- a/usr.bin/join/join.1
+++ b/usr.bin/join/join.1
@@ -32,9 +32,9 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.\"	@(#)join.1	8.1 (Berkeley) 6/6/93
+.\"	@(#)join.1	8.3 (Berkeley) 4/28/95
 .\"
-.Dd June 6, 1993
+.Dd April 28, 1995
 .Dt JOIN 1
 .Os
 .Sh NAME
@@ -84,6 +84,11 @@ The following options are available:
 In addition to the default output, produce a line for each unpairable
 line in file
 .Ar file_number .
+(The argument to
+.Fl a
+must not be preceded by a space; see the
+.Sx COMPATIBILITY
+section.)
 .It Fl e Ar string
 Replace empty output fields with
 .Ar string .
@@ -165,6 +170,10 @@ the following options are available:
 .It Fl a
 In addition to the default output, produce a line for each unpairable line
 in both file 1 and file 2.
+(To distinguish between this and
+.Fl a Ar file_number ,
+.Nm join
+currently requires that the latter not include any white space.)
 .It Fl j1 Ar field
 Join on the
 .Ar field Ns 'th