diff --git a/bar_filler.go b/bar_filler.go
index a0707ce..00bf0a4 100644
--- a/bar_filler.go
+++ b/bar_filler.go
@@ -18,7 +18,8 @@
 	rRefill
 )
 
-// DefaultBarStyle is applied when bar constructed with *Progress.AddBar method.
+// DefaultBarStyle is a string containing 7 runes.
+// Each rune is a building block of a progress bar.
 //
 //	'1st rune' stands for left boundary rune
 //
@@ -44,7 +45,7 @@
 	flush   func(w io.Writer, bb [][]byte)
 }
 
-// NewBarFiller constucts mpb.Filler, to be used with *Progress.Add method.
+// NewBarFiller constucts mpb.BarFiller, to be used with *Progress.Add(...) *Bar method.
 func NewBarFiller(style string, reverse bool) BarFiller {
 	if style == "" {
 		style = DefaultBarStyle
diff --git a/spinner_filler.go b/spinner_filler.go
index cc30151..517725f 100644
--- a/spinner_filler.go
+++ b/spinner_filler.go
@@ -18,7 +18,7 @@
 	SpinnerOnRight
 )
 
-// DefaultSpinnerStyle is applied when bar constructed with *Progress.AddSpinner method.
+// DefaultSpinnerStyle is a slice of strings, which makes a spinner.
 var DefaultSpinnerStyle = []string{"⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏"}
 
 type spinnerFiller struct {
@@ -27,7 +27,7 @@
 	alignment SpinnerAlignment
 }
 
-// NewSpinnerFiller constucts mpb.Filler, to be used with *Progress.Add method.
+// NewSpinnerFiller constucts mpb.BarFiller, to be used with *Progress.Add(...) *Bar method.
 func NewSpinnerFiller(style []string, alignment SpinnerAlignment) BarFiller {
 	if len(style) == 0 {
 		style = DefaultSpinnerStyle