diff --git a/src/lib.rs b/src/lib.rs
index 2964850..2015434 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1003,3 +1003,29 @@ impl MessageBehavior for VmcExtRemote {
         return Ok(VmcExtRemote { service, json });
     }
 }
+
+struct VmcExtOpt {
+    option: String,
+}
+
+impl MessageBehavior for VmcExtOpt {
+    fn to_osc_message(&self) -> OscMessage {
+        return OscMessage {
+            addr: String::from("/VMC/Ext/Opt"),
+            args: vec![OscType::from(self.option.to_owned())],
+        };
+    }
+    fn from_osc_message(msg: OscMessage) -> Result<Self, String> {
+        if msg.args.len() != 1 {
+            return Err(String::from("arg count invalid"));
+        }
+        match &msg.args[0] {
+            OscType::String(s) => {
+                return Ok(VmcExtOpt {
+                    option: s.to_owned(),
+                })
+            }
+            _ => return Err(String::from("arg type invalid")),
+        }
+    }
+}