diff --git a/decor/eta.go b/decor/eta.go
index ec8b056..691f8b7 100644
--- a/decor/eta.go
+++ b/decor/eta.go
@@ -22,10 +22,9 @@
 	return f(src)
 }
 
-// EwmaETA exponential-weighted-moving-average based ETA decorator.
-// For this decorator to work correctly you have to measure each
-// iteration's duration and pass it to the
-// *Bar.DecoratorEwmaUpdate(time.Duration) method after each increment.
+// EwmaETA exponential-weighted-moving-average based ETA decorator. For this
+// decorator to work correctly you have to measure each iteration's duration
+// and pass it to one of the (*Bar).EwmaIncr... family methods.
 func EwmaETA(style TimeStyle, age float64, wcc ...WC) Decorator {
 	var average ewma.MovingAverage
 	if age == 0 {
diff --git a/decor/speed.go b/decor/speed.go
index e37302e..47d54dc 100644
--- a/decor/speed.go
+++ b/decor/speed.go
@@ -29,9 +29,8 @@
 }
 
 // EwmaSpeed exponential-weighted-moving-average based speed decorator.
-// For this decorator to work correctly you have to measure each
-// iteration's duration and pass it to the
-// *Bar.DecoratorEwmaUpdate(time.Duration) method after each increment.
+// For this decorator to work correctly you have to measure each iteration's
+// duration and pass it to one of the (*Bar).EwmaIncr... family methods.
 func EwmaSpeed(unit int, format string, age float64, wcc ...WC) Decorator {
 	var average ewma.MovingAverage
 	if age == 0 {