diff --git a/libraries/AC_Fence/AC_Fence.cpp b/libraries/AC_Fence/AC_Fence.cpp
index 352df39d06..870643fe5f 100644
--- a/libraries/AC_Fence/AC_Fence.cpp
+++ b/libraries/AC_Fence/AC_Fence.cpp
@@ -39,7 +39,7 @@ const AP_Param::GroupInfo AC_Fence::var_info[] PROGMEM = {
     // @DisplayName: Circular Fence Radius
     // @Description: Circle fence radius which when breached will cause an RTL
     // @Units: Meters
-    // @Range: 0 10000
+    // @Range: 30 10000
     // @User: Standard
     AP_GROUPINFO("RADIUS",      4,  AC_Fence,   _circle_radius, AC_FENCE_CIRCLE_RADIUS_DEFAULT),