diff --git a/bar.go b/bar.go
index 41a8d7a..644b1fa 100644
--- a/bar.go
+++ b/bar.go
@@ -33,6 +33,10 @@
 	shutdown chan struct{}
 }
 
+// Filler interface.
+// Bar rednders by calling Filler's Fill method.  You can literally
+// have any bar kind, by implementing this interface and passing it
+// to the Add method.
 type Filler interface {
 	Fill(w io.Writer, width int, s *decor.Statistics)
 }
diff --git a/bar_option.go b/bar_option.go
index 7b44600..625f784 100644
--- a/bar_option.go
+++ b/bar_option.go
@@ -47,25 +47,28 @@
 	}
 }
 
-// BarRemoveOnComplete is a flag, if set whole bar line will be removed on complete event.
-// If both BarRemoveOnComplete and BarClearOnComplete are set, first bar section gets cleared
-// and then whole bar line gets removed completely.
+// BarRemoveOnComplete is a flag, if set whole bar line will be removed
+// on complete event.  If both BarRemoveOnComplete and BarClearOnComplete
+// are set, first bar section gets cleared and then whole bar line
+// gets removed completely.
 func BarRemoveOnComplete() BarOption {
 	return func(s *bState) {
 		s.removeOnComplete = true
 	}
 }
 
-// BarReplaceOnComplete is indicator for delayed bar start, after the `runningBar` is complete.
-// To achieve bar replacement effect, `runningBar` should has its `BarRemoveOnComplete` option set.
+// BarReplaceOnComplete is indicator for delayed bar start, after the
+// `runningBar` is complete.  To achieve bar replacement effect,
+// `runningBar` should has its `BarRemoveOnComplete` option set.
 func BarReplaceOnComplete(runningBar *Bar) BarOption {
 	return func(s *bState) {
 		s.runningBar = runningBar
 	}
 }
 
-// BarClearOnComplete is a flag, if set will clear bar section on complete event.
-// If you need to remove a whole bar line, refer to BarRemoveOnComplete.
+// BarClearOnComplete is a flag, if set will clear bar section on
+// complete event.  If you need to remove a whole bar line, refer to
+// BarRemoveOnComplete.
 func BarClearOnComplete() BarOption {
 	return func(s *bState) {
 		s.barClearOnComplete = true
@@ -73,16 +76,17 @@
 }
 
 // BarPriority sets bar's priority.
-// Zero is highest priority, i.e. bar will be on top.
-// If `BarReplaceOnComplete` option is supplied, this option is ignored.
+// Zero is highest priority, i.e. bar will be on top.  If
+// `BarReplaceOnComplete` option is supplied, this option is ignored.
 func BarPriority(priority int) BarOption {
 	return func(s *bState) {
 		s.priority = priority
 	}
 }
 
-// BarNewLineExtend takes user defined efn, which gets called each render cycle.
-// Any write to provided writer of efn, will appear on new line of respective bar.
+// BarNewLineExtend takes user defined efn, which gets called each
+// render cycle.  Any write to provided writer of efn, will appear on
+// new line of respective bar.
 func BarNewLineExtend(efn func(io.Writer, *decor.Statistics)) BarOption {
 	return func(s *bState) {
 		s.newLineExtendFn = efn
@@ -136,9 +140,9 @@
 	return MakeFillerTypeSpecificBarOption(chk, cb)
 }
 
-// MakeFillerTypeSpecificBarOption makes BarOption specific to Filler's actual type.
-// If you implement your own Filler, so most probably you'll need this.
-// See BarStyle or SpinnerStyle for example.
+// MakeFillerTypeSpecificBarOption makes BarOption specific to Filler's
+// actual type.  If you implement your own Filler, so most probably
+// you'll need this.  See BarStyle or SpinnerStyle for example.
 func MakeFillerTypeSpecificBarOption(
 	typeChecker func(Filler) (interface{}, bool),
 	cb func(interface{}),
diff --git a/decor/counters.go b/decor/counters.go
index e4161dc..7d581ee 100644
--- a/decor/counters.go
+++ b/decor/counters.go
@@ -141,12 +141,14 @@
 	return Counters(0, pairFormat, wcc...)
 }
 
-// CountersKibiByte is a wrapper around Counters with predefined unit UnitKiB (bytes/1024).
+// CountersKibiByte is a wrapper around Counters with predefined unit
+// UnitKiB (bytes/1024).
 func CountersKibiByte(pairFormat string, wcc ...WC) Decorator {
 	return Counters(UnitKiB, pairFormat, wcc...)
 }
 
-// CountersKiloByte is a wrapper around Counters with predefined unit UnitKB (bytes/1000).
+// CountersKiloByte is a wrapper around Counters with predefined unit
+// UnitKB (bytes/1000).
 func CountersKiloByte(pairFormat string, wcc ...WC) Decorator {
 	return Counters(UnitKB, pairFormat, wcc...)
 }
diff --git a/decor/decorator.go b/decor/decorator.go
index 6aaf6c8..77086a0 100644
--- a/decor/decorator.go
+++ b/decor/decorator.go
@@ -47,35 +47,37 @@
 }
 
 // Decorator interface.
-// A decorator must implement this interface, in order to be used with mpb library.
+// A decorator must implement this interface, in order to be used with
+// mpb library.
 type Decorator interface {
 	Decor(*Statistics) string
 	Syncable
 }
 
 // Syncable interface.
-// All decorators implement this interface implicitly.
-// Its Syncable method exposes width sync channel, if sync is enabled.
+// All decorators implement this interface implicitly.  Its Syncable
+// method exposes width sync channel, if sync is enabled.
 type Syncable interface {
 	Syncable() (bool, chan int)
 }
 
 // OnCompleteMessenger interface.
-// Decorators implementing this interface suppose to return provided string on complete event.
+// Decorators implementing this interface suppose to return provided
+// string on complete event.
 type OnCompleteMessenger interface {
 	OnCompleteMessage(string)
 }
 
 // AmountReceiver interface.
-// If decorator needs to receive increment amount,
-// so this is the right interface to implement.
+// If decorator needs to receive increment amount, so this is the right
+// interface to implement.
 type AmountReceiver interface {
 	NextAmount(int, ...time.Duration)
 }
 
 // ShutdownListener interface.
-// If decorator needs to be notified once upon bar shutdown event,
-// so this is the right interface to implement.
+// If decorator needs to be notified once upon bar shutdown event, so
+// this is the right interface to implement.
 type ShutdownListener interface {
 	Shutdown()
 }
@@ -130,8 +132,8 @@
 	return (wc.C & DSyncWidth) != 0, wc.wsync
 }
 
-// OnComplete returns decorator, which wraps provided decorator, with sole
-// purpose to display provided message on complete event.
+// OnComplete returns decorator, which wraps provided decorator, with
+// sole purpose to display provided message on complete event.
 //
 //	`decorator` Decorator to wrap
 //
diff --git a/decor/moving-average.go b/decor/moving-average.go
index f9596a2..bce7755 100644
--- a/decor/moving-average.go
+++ b/decor/moving-average.go
@@ -6,9 +6,9 @@
 	"github.com/VividCortex/ewma"
 )
 
-// MovingAverage is the interface that computes a moving average over a time-
-// series stream of numbers. The average may be over a window or exponentially
-// decaying.
+// MovingAverage is the interface that computes a moving average over
+// a time- series stream of numbers. The average may be over a window
+// or exponentially decaying.
 type MovingAverage interface {
 	Add(float64)
 	Value() float64
@@ -57,7 +57,8 @@
 	s.count++
 }
 
-// NewMedianEwma is ewma based MovingAverage, which gets its values from median MovingAverage.
+// NewMedianEwma is ewma based MovingAverage, which gets its values
+// from median MovingAverage.
 func NewMedianEwma(age ...float64) MovingAverage {
 	return &medianEwma{
 		MovingAverage: ewma.NewMovingAverage(age...),
diff --git a/decor/speed.go b/decor/speed.go
index 395e5d0..74658ce 100644
--- a/decor/speed.go
+++ b/decor/speed.go
@@ -137,7 +137,8 @@
 	return MovingAverageSpeed(unit, unitFormat, ewma.NewMovingAverage(age), wcc...)
 }
 
-// MovingAverageSpeed decorator relies on MovingAverage implementation to calculate its average.
+// MovingAverageSpeed decorator relies on MovingAverage implementation
+// to calculate its average.
 //
 //	`unit` one of [0|UnitKiB|UnitKB] zero for no unit
 //
diff --git a/options.go b/options.go
index a0e5bf8..0d7cb78 100644
--- a/options.go
+++ b/options.go
@@ -9,14 +9,14 @@
 	"github.com/vbauerster/mpb/cwriter"
 )
 
-// ProgressOption is a function option which changes the default behavior of
-// progress pool, if passed to mpb.New(...ProgressOption).
+// ProgressOption is a function option which changes the default
+// behavior of progress pool, if passed to mpb.New(...ProgressOption).
 type ProgressOption func(*pState)
 
-// WithWaitGroup provides means to have a single joint point.
-// If *sync.WaitGroup is provided, you can safely call just p.Wait()
-// without calling Wait() on provided *sync.WaitGroup.
-// Makes sense when there are more than one bar to render.
+// WithWaitGroup provides means to have a single joint point.  If
+// *sync.WaitGroup is provided, you can safely call just p.Wait()
+// without calling Wait() on provided *sync.WaitGroup.  Makes sense
+// when there are more than one bar to render.
 func WithWaitGroup(wg *sync.WaitGroup) ProgressOption {
 	return func(s *pState) {
 		s.uwg = wg
@@ -60,7 +60,8 @@
 	}
 }
 
-// WithShutdownNotifier provided chanel will be closed, after all bars have been rendered.
+// WithShutdownNotifier provided chanel will be closed, after all bars
+// have been rendered.
 func WithShutdownNotifier(ch chan struct{}) ProgressOption {
 	return func(s *pState) {
 		s.shutdownNotifier = ch