diff --git a/ArduSub/Parameters.cpp b/ArduSub/Parameters.cpp
index 710ac1cd55..b31f77cf79 100644
--- a/ArduSub/Parameters.cpp
+++ b/ArduSub/Parameters.cpp
@@ -59,7 +59,7 @@ const AP_Param::Info Sub::var_info[] = {
     // @User: Advanced
     // @Units: Hz
     // @Range: 0 10
-    // @Increment: .5
+    // @Increment: 0.5
     GSCALAR(throttle_filt,  "PILOT_THR_FILT",     0),
 
     // AP_SerialManager was here