diff --git a/src/main.rs b/src/main.rs
index 89b16bed8..42ec38477 100755
--- a/src/main.rs
+++ b/src/main.rs
@@ -122,13 +122,7 @@ fn create_app<'a, 'b>(
         .arg(
             Arg::with_name("disk")
                 .long("disk")
-                .help(
-                    "Disk parameters \
-                     \"path=<disk_image_path>,readonly=on|off,iommu=on|off,\
-                     num_queues=<number_of_queues>,queue_size=<size_of_each_queue>,\
-                     vhost_user=<vhost_user_enable>,socket=<vhost_user_socket_path>,\
-                     wce=<true|false, default true>\"",
-                )
+                .help(config::DiskConfig::SYNTAX)
                 .takes_value(true)
                 .min_values(1)
                 .group("vm-config"),
diff --git a/vmm/src/config.rs b/vmm/src/config.rs
index e09c4033c..3a88024b5 100644
--- a/vmm/src/config.rs
+++ b/vmm/src/config.rs
@@ -374,6 +374,11 @@ fn default_diskconfig_poll_queue() -> bool {
 }
 
 impl DiskConfig {
+    pub const SYNTAX: &'static str = "Disk parameters \
+         \"path=<disk_image_path>,readonly=on|off,iommu=on|off,num_queues=<number_of_queues>,\
+         queue_size=<size_of_each_queue>,vhost_user=<vhost_user_enable>,\
+         socket=<vhost_user_socket_path>,wce=<true|false, default true>\"";
+
     pub fn parse(disk: &str) -> Result<Self> {
         // Split the parameters based on the comma delimiter
         let params_list: Vec<&str> = disk.split(',').collect();