diff --git a/lang/m2/comp/modula-2.1 b/lang/m2/comp/modula-2.1
index d3fd8400c..be4c36d2c 100644
--- a/lang/m2/comp/modula-2.1
+++ b/lang/m2/comp/modula-2.1
@@ -86,7 +86,7 @@ This is useful for interpreters that use the "real" MIN(INTEGER) to
 indicate "undefined".
 .LP
 .SH SEE ALSO
-\fIack\fR(1), \fIem_m2\fR(6)
+\fIack\fR(1ACK), \fIem_m2\fR(6ACK), \fIm2mm(1ACK)\fR
 .SH FILES
 .IR ~em/lib/em_m2 :
 binary of the Modula-2 compiler.
diff --git a/util/ack/ack.1.X b/util/ack/ack.1.X
index aa54a90b4..78c21cbe4 100644
--- a/util/ack/ack.1.X
+++ b/util/ack/ack.1.X
@@ -124,6 +124,8 @@ Verbose.
 Print information while juggling with files.
 .IP \-KR
 Tell the C-compiler to conform to "Kernighan & Ritchie" C.
+.IP \-fp
+Use floating point package, if not for VAX or PDP.
 .SB preprocessing
 .IP \-I\fIdir\fP
 \&\`#include\' files whose names do not begin with \`/\' are