diff --git a/solanaceae/ngc_ft1/flow_only.cpp b/solanaceae/ngc_ft1/flow_only.cpp
index cba9848..8c769dd 100644
--- a/solanaceae/ngc_ft1/flow_only.cpp
+++ b/solanaceae/ngc_ft1/flow_only.cpp
@@ -114,6 +114,8 @@ void FlowOnly::onSent(SeqIDType seq, size_t data_size) {
 	);
 	_in_flight_bytes += data_size + SEGMENT_OVERHEAD;
 	//_recently_sent_bytes += data_size + SEGMENT_OVERHEAD;
+
+	_time_point_last_update = getTimeNow();
 }
 
 void FlowOnly::onAck(std::vector<SeqIDType> seqs) {
@@ -124,6 +126,8 @@ void FlowOnly::onAck(std::vector<SeqIDType> seqs) {
 
 	const auto now {getTimeNow()};
 
+	_time_point_last_update = now;
+
 	// first seq in seqs is the actual value, all extra are for redundency
 	{ // skip in ack is congestion event
 		// 1. look at primary ack of packet
diff --git a/solanaceae/ngc_ft1/flow_only.hpp b/solanaceae/ngc_ft1/flow_only.hpp
index 90262c6..3cdd2ed 100644
--- a/solanaceae/ngc_ft1/flow_only.hpp
+++ b/solanaceae/ngc_ft1/flow_only.hpp
@@ -38,6 +38,9 @@ struct FlowOnly : public CCAI {
 
 		clock::time_point _time_start_offset;
 
+		// used to clamp growth rate in the void
+		double _time_point_last_update {getTimeNow()};
+
 	protected:
 		// make values relative to algo start for readability (and precision)
 		// get timestamp in seconds