diff --git a/contrib/mkseccomp.pl b/contrib/mkseccomp.pl
index 44088f952c..5c583cc3d3 100755
--- a/contrib/mkseccomp.pl
+++ b/contrib/mkseccomp.pl
@@ -41,7 +41,7 @@ use warnings;
 
 if( -t ) {
     print STDERR "Helper script to make seccomp filters for Docker/LXC.\n";
-    print STDERR "Usage: mkseccomp.pl [files...]\n";
+    print STDERR "Usage: mkseccomp.pl < [files...]\n";
     exit 1;
 }
 
diff --git a/contrib/mkseccomp.sample b/contrib/mkseccomp.sample
index 25bf4822dc..7a0c8d1925 100644
--- a/contrib/mkseccomp.sample
+++ b/contrib/mkseccomp.sample
@@ -195,6 +195,7 @@ shutdown
 socket                 // (*)
 socketcall
 socketpair
+sethostname            // (*)
 
 // Signal related
 pause
@@ -261,7 +262,7 @@ vmsplice
 
 // Process control
 capget
-//capset
+capset                 // (*)
 clone                  // (*)
 execve                 // (*)
 exit                   // (*)
@@ -401,7 +402,6 @@ tkill
 //quotactl
 //reboot
 //setdomainname
-//sethostname
 //setns
 //settimeofday
 //sgetmask             // Obsolete