diff --git a/README.md b/README.md
index e108515..f5b8809 100644
--- a/README.md
+++ b/README.md
@@ -90,7 +90,7 @@ Close()
 type Options struct {
 	Bitrate    int     // Bitrate.
 	Loop       int     // For GIFs only. -1=no loop, 0=infinite loop, >0=number of loops.
-	Delay      int     // Delay for final frame of GIFs.
+	Delay      int     // Delay for final frame of GIFs in centiseconds.
 	Macro      int     // Macroblock size for determining how to resize frames for codecs.
 	FPS        float64 // Frames per second for output video.
 	Quality    float64 // If bitrate not given, use quality instead. Must be between 0 and 1. 0:best, 1:worst.
diff --git a/camera.go b/camera.go
index 400ab02..a5c18fd 100644
--- a/camera.go
+++ b/camera.go
@@ -25,6 +25,7 @@ type Camera struct {
 	cmd         *exec.Cmd      // ffmpeg command.
 }
 
+// Camera device name.
 func (camera *Camera) Name() string {
 	return camera.name
 }
@@ -37,10 +38,12 @@ func (camera *Camera) Height() int {
 	return camera.height
 }
 
+// Channels of video frames.
 func (camera *Camera) Depth() int {
 	return camera.depth
 }
 
+// Frames per second of video.
 func (camera *Camera) FPS() float64 {
 	return camera.fps
 }
diff --git a/video.go b/video.go
index 546e2fb..9ecbbfe 100644
--- a/video.go
+++ b/video.go
@@ -45,7 +45,7 @@ func (video *Video) Depth() int {
 	return video.depth
 }
 
-// Bitrate of video.
+// Bitrate of video in bits/s.
 func (video *Video) Bitrate() int {
 	return video.bitrate
 }
@@ -60,10 +60,12 @@ func (video *Video) Stream() int {
 	return video.stream
 }
 
+// Video duration in seconds.
 func (video *Video) Duration() float64 {
 	return video.duration
 }
 
+// Frames per second of video.
 func (video *Video) FPS() float64 {
 	return video.fps
 }
diff --git a/videowriter.go b/videowriter.go
index 54c7b9a..084a0ea 100644
--- a/videowriter.go
+++ b/videowriter.go
@@ -31,7 +31,7 @@ type VideoWriter struct {
 type Options struct {
 	Bitrate    int     // Bitrate.
 	Loop       int     // For GIFs only. -1=no loop, 0=infinite loop, >0=number of loops.
-	Delay      int     // Delay for final frame of GIFs.
+	Delay      int     // Delay for final frame of GIFs in centiseconds.
 	Macro      int     // Macroblock size for determining how to resize frames for codecs.
 	FPS        float64 // Frames per second for output video.
 	Quality    float64 // If bitrate not given, use quality instead. Must be between 0 and 1. 0:best, 1:worst.
@@ -56,26 +56,32 @@ func (writer *VideoWriter) Height() int {
 	return writer.height
 }
 
+// Bitrate of video in bits/s.
 func (writer *VideoWriter) Bitrate() int {
 	return writer.bitrate
 }
 
+// For GIFs only, defines looping behavior. -1=no loop, 0=infinite loop, >0=number of loops.
 func (writer *VideoWriter) Loop() int {
 	return writer.loop
 }
 
+// Delay for final frame of GIFs in centiseconds.
 func (writer *VideoWriter) Delay() int {
 	return writer.delay
 }
 
+// Macroblock size for determining how to resize frames for codecs.
 func (writer *VideoWriter) Macro() int {
 	return writer.macro
 }
 
+// Frames per second of video.
 func (writer *VideoWriter) FPS() float64 {
 	return writer.fps
 }
 
+// Video Codec Quality parameter. Must be between 0 and 1. 0:best, 1:worst.
 func (writer *VideoWriter) Quality() float64 {
 	return writer.quality
 }