+.IR msg .
+Use of this option is deprecated.
+.SS "Argument format"
+The
+.B \-a
+and
+.B \-m
+options are deprecated, though retained for compatibility reasons.
+It's recommended that you use the non-option specification instead.
+.PP
+Each argument specifies an atom name and a list of message strings to
+listen to. Multiple properties may be listened for, and multiple
+messages may be accepted for each property. If no messages are
+specified then all values are considered to be acceptable. The program
+exits when any property is set to an acceptable value.
+.PP
+If no atoms are given on the command line,
+.B xwait
+will wait for
+.B XWAIT_PROPERTY
+to be set to