diff --git a/ArduPlane/quadplane.cpp b/ArduPlane/quadplane.cpp
index 87be3e1160..f0145ada3e 100644
--- a/ArduPlane/quadplane.cpp
+++ b/ArduPlane/quadplane.cpp
@@ -350,7 +350,7 @@ const AP_Param::GroupInfo QuadPlane::var_info2[] = {
     // @DisplayName: Throttle expo strength
     // @Description: Amount of curvature in throttle curve: 0 is linear, 1 is cubic
     // @Range: 0 1
-    // @Increment: .1
+    // @Increment: 0.1
     // @User: Advanced
     AP_GROUPINFO("THROTTLE_EXPO", 10, QuadPlane, throttle_expo, 0.2),