diff --git a/xCAT-probe/subcmds/xcatmn b/xCAT-probe/subcmds/xcatmn
index 6285d06ff..36f10c4ef 100755
--- a/xCAT-probe/subcmds/xcatmn
+++ b/xCAT-probe/subcmds/xcatmn
@@ -514,9 +514,9 @@ sub check_disk {
             }
             my $mountmun = $#{$mountpointinfo{$mountpoint}{mount}} +1 ;
             if($mountmun >1){
-                $msg .= "these directories are parts of file system '$mountpoint'. The free space available in directory '$mountpoint' is $mountpointinfo{$mountpoint}{available} GiB, it isn't enough.";
+                $msg .= "these directories are parts of file system '$mountpoint'. The free space available in directory '$mountpoint' is $mountpointinfo{$mountpoint}{available} GiB, it is not enough.";
             }else{
-                $msg .= "This directory is a part of file system '$mountpoint'. The free space available in directory '$mountpoint' is $mountpointinfo{$mountpoint}{available} GiB, it isn't enough.";
+                $msg .= "This directory is a part of file system '$mountpoint'. The free space available in directory '$mountpoint' is $mountpointinfo{$mountpoint}{available} GiB, it is not enough.";
             }
             $rst = 1;
         }