diff --git a/libraries/AC_Fence/AC_Fence.cpp b/libraries/AC_Fence/AC_Fence.cpp
index c3c9086297..5f772566ea 100644
--- a/libraries/AC_Fence/AC_Fence.cpp
+++ b/libraries/AC_Fence/AC_Fence.cpp
@@ -37,7 +37,7 @@ const AP_Param::GroupInfo AC_Fence::var_info[] = {
     // @User: Standard
     AP_GROUPINFO("ACTION",      2,  AC_Fence,   _action,        AC_FENCE_ACTION_RTL_AND_LAND),
 
-    // @Param: ALT_MAX
+    // @Param{Copter, Sub}: ALT_MAX
     // @DisplayName: Fence Maximum Altitude
     // @Description: Maximum altitude allowed before geofence triggers
     // @Units: m