diff --git a/bar.go b/bar.go
index 6e0f96b..86e7569 100644
--- a/bar.go
+++ b/bar.go
@@ -101,7 +101,7 @@
 
 // SetWidth overrides width of individual bar
 func (b *Bar) SetWidth(n int) *Bar {
-	if n < 2 || IsClosed(b.done) {
+	if n < 2 || isClosed(b.done) {
 		return b
 	}
 	b.widthCh <- n
@@ -110,7 +110,7 @@
 
 // TrimLeftSpace removes space befor LeftEnd charater
 func (b *Bar) TrimLeftSpace() *Bar {
-	if IsClosed(b.done) {
+	if isClosed(b.done) {
 		return b
 	}
 	b.trimLeftCh <- true
@@ -119,7 +119,7 @@
 
 // TrimRightSpace removes space after RightEnd charater
 func (b *Bar) TrimRightSpace() *Bar {
-	if IsClosed(b.done) {
+	if isClosed(b.done) {
 		return b
 	}
 	b.trimRightCh <- true
@@ -128,7 +128,7 @@
 
 // Format overrides format of individual bar
 func (b *Bar) Format(format string) *Bar {
-	if utf8.RuneCountInString(format) != numFmtRunes || IsClosed(b.done) {
+	if utf8.RuneCountInString(format) != numFmtRunes || isClosed(b.done) {
 		return b
 	}
 	b.formatCh <- format
@@ -139,7 +139,7 @@
 // Defaults to 0.25
 // Normally you shouldn't touch this
 func (b *Bar) SetEtaAlpha(a float64) *Bar {
-	if IsClosed(b.done) {
+	if isClosed(b.done) {
 		return b
 	}
 	b.etaAlphaCh <- a
@@ -153,7 +153,7 @@
 
 // Incr increments progress bar
 func (b *Bar) Incr(n int) {
-	if n < 1 || IsClosed(b.done) {
+	if n < 1 || isClosed(b.done) {
 		return
 	}
 	b.incrCh <- int64(n)
@@ -161,7 +161,7 @@
 
 // IncrWithReFill increments pb with different fill character
 func (b *Bar) IncrWithReFill(n int, r rune) {
-	if IsClosed(b.done) {
+	if isClosed(b.done) {
 		return
 	}
 	b.Incr(n)
@@ -196,12 +196,12 @@
 // InProgress returns true, while progress is running
 // Can be used as condition in for loop
 func (b *Bar) InProgress() bool {
-	return !IsClosed(b.done)
+	return !isClosed(b.done)
 }
 
 // PrependFunc prepends DecoratorFunc
 func (b *Bar) PrependFunc(f DecoratorFunc) *Bar {
-	if IsClosed(b.done) {
+	if isClosed(b.done) {
 		return b
 	}
 	b.decoratorCh <- &decorator{decPrepend, f}
@@ -210,7 +210,7 @@
 
 // RemoveAllPrependers removes all prepend functions
 func (b *Bar) RemoveAllPrependers() {
-	if IsClosed(b.done) {
+	if isClosed(b.done) {
 		return
 	}
 	b.decoratorCh <- &decorator{decPrependZero, nil}
@@ -218,7 +218,7 @@
 
 // AppendFunc appends DecoratorFunc
 func (b *Bar) AppendFunc(f DecoratorFunc) *Bar {
-	if IsClosed(b.done) {
+	if isClosed(b.done) {
 		return b
 	}
 	b.decoratorCh <- &decorator{decAppend, f}
@@ -227,7 +227,7 @@
 
 // RemoveAllAppenders removes all append functions
 func (b *Bar) RemoveAllAppenders() {
-	if IsClosed(b.done) {
+	if isClosed(b.done) {
 		return
 	}
 	b.decoratorCh <- &decorator{decAppendZero, nil}
@@ -237,14 +237,14 @@
 // You should call this method when total is unknown and you've reached the point
 // of process completion.
 func (b *Bar) Completed() {
-	if IsClosed(b.done) {
+	if isClosed(b.done) {
 		return
 	}
 	b.completeReqCh <- struct{}{}
 }
 
 func (b *Bar) getState() state {
-	if IsClosed(b.done) {
+	if isClosed(b.done) {
 		return b.state
 	}
 	ch := make(chan state, 1)
@@ -334,14 +334,14 @@
 }
 
 func (b *Bar) flushed() {
-	if IsClosed(b.done) {
+	if isClosed(b.done) {
 		return
 	}
 	b.flushedCh <- struct{}{}
 }
 
 func (b *Bar) remove() {
-	if IsClosed(b.done) {
+	if isClosed(b.done) {
 		return
 	}
 	b.removeReqCh <- struct{}{}
diff --git a/progress.go b/progress.go
index 7042893..06a861d 100644
--- a/progress.go
+++ b/progress.go
@@ -109,7 +109,7 @@
 // SetOut sets underlying writer of progress. Default is os.Stdout
 // pancis, if called on stopped Progress instance, i.e after Stop()
 func (p *Progress) SetOut(w io.Writer) *Progress {
-	if IsClosed(p.done) {
+	if isClosed(p.done) {
 		panic(ErrCallAfterStop)
 	}
 	if w == nil {
@@ -122,7 +122,7 @@
 // RefreshRate overrides default (100ms) refresh rate value
 // pancis, if called on stopped Progress instance, i.e after Stop()
 func (p *Progress) RefreshRate(d time.Duration) *Progress {
-	if IsClosed(p.done) {
+	if isClosed(p.done) {
 		panic(ErrCallAfterStop)
 	}
 	p.rrChangeReqCh <- d
@@ -131,7 +131,7 @@
 
 // BeforeRenderFunc accepts a func, which gets called before render process.
 func (p *Progress) BeforeRenderFunc(f BeforeRender) *Progress {
-	if IsClosed(p.done) {
+	if isClosed(p.done) {
 		panic(ErrCallAfterStop)
 	}
 	p.brCh <- f
@@ -147,7 +147,7 @@
 // AddBarWithID creates a new progress bar and adds to the container
 // pancis, if called on stopped Progress instance, i.e after Stop()
 func (p *Progress) AddBarWithID(id int, total int64) *Bar {
-	if IsClosed(p.done) {
+	if isClosed(p.done) {
 		panic(ErrCallAfterStop)
 	}
 	result := make(chan bool)
@@ -162,7 +162,7 @@
 // RemoveBar removes bar at any time
 // pancis, if called on stopped Progress instance, i.e after Stop()
 func (p *Progress) RemoveBar(b *Bar) bool {
-	if IsClosed(p.done) {
+	if isClosed(p.done) {
 		panic(ErrCallAfterStop)
 	}
 	result := make(chan bool)
@@ -173,7 +173,7 @@
 // BarCount returns bars count in the container.
 // Pancis if called on stopped Progress instance, i.e after Stop()
 func (p *Progress) BarCount() int {
-	if IsClosed(p.done) {
+	if isClosed(p.done) {
 		panic(ErrCallAfterStop)
 	}
 	respCh := make(chan int)
@@ -194,7 +194,7 @@
 // Stop waits for bars to finish rendering and stops the rendering goroutine
 func (p *Progress) Stop() {
 	p.wg.Wait()
-	if IsClosed(p.done) {
+	if isClosed(p.done) {
 		return
 	}
 	close(p.operationCh)
@@ -305,9 +305,9 @@
 	return ibars
 }
 
-// IsClosed check if ch closed
+// isClosed check if ch closed
 // caution see: http://www.tapirgames.com/blog/golang-channel-closing
-func IsClosed(ch <-chan struct{}) bool {
+func isClosed(ch <-chan struct{}) bool {
 	select {
 	case <-ch:
 		return true