diff --git a/mach/mantra/int/em.1 b/mach/mantra/int/em.1
index 94a0154cb..20ef472b9 100644
--- a/mach/mantra/int/em.1
+++ b/mach/mantra/int/em.1
@@ -75,7 +75,7 @@ source line flow data
 last lines executed
 .PD
 .SH "SEE ALSO"
-\fIack\fP(I),
+\fIack\fP(1ACK),
 .SH BUGS
 Most error messages are self explanatory.
 If runtime flags are turned on it is advisable to try again