diff --git a/ArduPlane/Log.cpp b/ArduPlane/Log.cpp
index bf833d9bd7..9697b10b67 100644
--- a/ArduPlane/Log.cpp
+++ b/ArduPlane/Log.cpp
@@ -386,6 +386,7 @@ const struct LogStructure Plane::log_structure[] = {
 // @Field: I: integral part of PID
 // @Field: D: derivative part of PID
 // @Field: FF: controller feed-forward portion of response
+// @Field: Dmod: scaler applied to D gain to reduce limit cycling
     { LOG_PIQR_MSG, sizeof(log_PID),
       "PIQR", PID_FMT,  PID_LABELS, PID_UNITS, PID_MULTS },
     { LOG_PIQP_MSG, sizeof(log_PID),
@@ -405,6 +406,7 @@ const struct LogStructure Plane::log_structure[] = {
 // @Field: I: integral part of PID
 // @Field: D: derivative part of PID
 // @Field: FF: controller feed-forward portion of response
+// @Field: Dmod: scaler applied to D gain to reduce limit cycling
     { LOG_PIDG_MSG, sizeof(log_PID),
       "PIDG", PID_FMT,  PID_LABELS, PID_UNITS, PID_MULTS },