docs: improve comment

Telenav · Mar 31, 2020 · 92e8cfb · 92e8cfb
1 parent d9d27be
commit 92e8cfb
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diff --git a/integration/traffic/historicalspeed/historical_speeds.go b/integration/traffic/historicalspeed/historical_speeds.go
@@ -41,7 +41,7 @@ func (s *Speeds) Load() error {
 }
 
 // QueryHistoricalSpeed return the speed for a way at a specified time
-// wayID: positive means forward, negative means backward
+// wayID: positive means travel forward, which is travel following edge's point sequence, negative means backward
 // t: UTC time
 func (s *Speeds) QueryHistoricalSpeed(wayID int64, t time.Time) (float64, bool) {
 

diff --git a/integration/traffic/interface.go b/integration/traffic/interface.go
@@ -6,7 +6,7 @@ import "time"
 type HistoricalSpeedQuerier interface {
 
 	// QueryHistoricalSpeed return the speed for a way at a specified time
-	// wayID: positive means forward, negative means backward
+	// wayID: positive means travel forward, which is travel following edge's point sequence, negative means backward
 	// t: UTC time
 	QueryHistoricalSpeed(wayID int64, t time.Time) (float64, bool)
 }