diff --git a/libraries/AC_AttitudeControl/AC_AttitudeControl_Heli.cpp b/libraries/AC_AttitudeControl/AC_AttitudeControl_Heli.cpp
index 463498600e..53f5b2746c 100644
--- a/libraries/AC_AttitudeControl/AC_AttitudeControl_Heli.cpp
+++ b/libraries/AC_AttitudeControl/AC_AttitudeControl_Heli.cpp
@@ -58,7 +58,7 @@ const AP_Param::GroupInfo AC_AttitudeControl_Heli::var_info[] = {
     // @Param: RAT_RLL_FLTT
     // @DisplayName: Roll axis rate controller target frequency in Hz
     // @Description: Roll axis rate controller target frequency in Hz
-    // @Range: 1 50
+    // @Range: 5 50
     // @Increment: 1
     // @Units: Hz
     // @User: Standard
@@ -66,7 +66,7 @@ const AP_Param::GroupInfo AC_AttitudeControl_Heli::var_info[] = {
     // @Param: RAT_RLL_FLTE
     // @DisplayName: Roll axis rate controller error frequency in Hz
     // @Description: Roll axis rate controller error frequency in Hz
-    // @Range: 1 50
+    // @Range: 5 50
     // @Increment: 1
     // @Units: Hz
     // @User: Standard
@@ -74,7 +74,7 @@ const AP_Param::GroupInfo AC_AttitudeControl_Heli::var_info[] = {
     // @Param: RAT_RLL_FLTD
     // @DisplayName: Roll axis rate controller derivative frequency in Hz
     // @Description: Roll axis rate controller derivative frequency in Hz
-    // @Range: 1 50
+    // @Range: 0 50
     // @Increment: 1
     // @Units: Hz
     // @User: Standard
@@ -124,7 +124,7 @@ const AP_Param::GroupInfo AC_AttitudeControl_Heli::var_info[] = {
     // @Param: RAT_PIT_FLTT
     // @DisplayName: Pitch axis rate controller target frequency in Hz
     // @Description: Pitch axis rate controller target frequency in Hz
-    // @Range: 1 50
+    // @Range: 5 50
     // @Increment: 1
     // @Units: Hz
     // @User: Standard
@@ -132,7 +132,7 @@ const AP_Param::GroupInfo AC_AttitudeControl_Heli::var_info[] = {
     // @Param: RAT_PIT_FLTE
     // @DisplayName: Pitch axis rate controller error frequency in Hz
     // @Description: Pitch axis rate controller error frequency in Hz
-    // @Range: 1 50
+    // @Range: 5 50
     // @Increment: 1
     // @Units: Hz
     // @User: Standard
@@ -140,7 +140,7 @@ const AP_Param::GroupInfo AC_AttitudeControl_Heli::var_info[] = {
     // @Param: RAT_PIT_FLTD
     // @DisplayName: Pitch axis rate controller derivative frequency in Hz
     // @Description: Pitch axis rate controller derivative frequency in Hz
-    // @Range: 1 50
+    // @Range: 0 50
     // @Increment: 1
     // @Units: Hz
     // @User: Standard
@@ -190,7 +190,7 @@ const AP_Param::GroupInfo AC_AttitudeControl_Heli::var_info[] = {
     // @Param: RAT_YAW_FLTT
     // @DisplayName: Yaw axis rate controller target frequency in Hz
     // @Description: Yaw axis rate controller target frequency in Hz
-    // @Range: 1 50
+    // @Range: 5 50
     // @Increment: 1
     // @Units: Hz
     // @User: Standard
@@ -198,7 +198,7 @@ const AP_Param::GroupInfo AC_AttitudeControl_Heli::var_info[] = {
     // @Param: RAT_YAW_FLTE
     // @DisplayName: Yaw axis rate controller error frequency in Hz
     // @Description: Yaw axis rate controller error frequency in Hz
-    // @Range: 1 50
+    // @Range: 5 50
     // @Increment: 1
     // @Units: Hz
     // @User: Standard
@@ -206,7 +206,7 @@ const AP_Param::GroupInfo AC_AttitudeControl_Heli::var_info[] = {
     // @Param: RAT_YAW_FLTD
     // @DisplayName: Yaw axis rate controller derivative frequency in Hz
     // @Description: Yaw axis rate controller derivative frequency in Hz
-    // @Range: 1 50
+    // @Range: 0 50
     // @Increment: 1
     // @Units: Hz
     // @User: Standard