diff --git a/opts/envfile.go b/opts/envfile.go
index 1a7284f56c..a1cfbae5e4 100644
--- a/opts/envfile.go
+++ b/opts/envfile.go
@@ -9,13 +9,13 @@ import (
 )
 
 var (
-	// EnvironmentVariableRegexp A regexp to validate correct environment variables
+	// EnvironmentVariableRegexp is a regexp to validate correct environment variables
 	// Environment variables set by the user must have a name consisting solely of
 	// alphabetics, numerics, and underscores - the first of which must not be numeric.
 	EnvironmentVariableRegexp = regexp.MustCompile("^[[:alpha:]_][[:alpha:][:digit:]_]*$")
 )
 
-// ParseEnvFile Read in a line delimited file with environment variables enumerated
+// ParseEnvFile reads a file with environment variables enumerated by lines
 func ParseEnvFile(filename string) ([]string, error) {
 	fh, err := os.Open(filename)
 	if err != nil {
diff --git a/opts/hosts_unix.go b/opts/hosts_unix.go
index a29335e605..611407a9d9 100644
--- a/opts/hosts_unix.go
+++ b/opts/hosts_unix.go
@@ -4,4 +4,5 @@ package opts
 
 import "fmt"
 
+// DefaultHost constant defines the default host string used by docker on other hosts than Windows
 var DefaultHost = fmt.Sprintf("unix://%s", DefaultUnixSocket)
diff --git a/opts/hosts_windows.go b/opts/hosts_windows.go
index 55eac2aaca..0b5c8a5b8d 100644
--- a/opts/hosts_windows.go
+++ b/opts/hosts_windows.go
@@ -4,4 +4,5 @@ package opts
 
 import "fmt"
 
+// DefaultHost constant defines the default host string used by docker on Windows
 var DefaultHost = fmt.Sprintf("tcp://%s:%d", DefaultHTTPHost, DefaultHTTPPort)
diff --git a/opts/ip.go b/opts/ip.go
index 1268789fb1..d787b56ca6 100644
--- a/opts/ip.go
+++ b/opts/ip.go
@@ -5,12 +5,14 @@ import (
 	"net"
 )
 
-// IPOpt type that hold an IP
+// IPOpt holds an IP. It is used to store values from CLI flags.
 type IPOpt struct {
 	*net.IP
 }
 
-// NewIPOpt returns a new IPOpt from a string of an IP.
+// NewIPOpt creates a new IPOpt from a reference net.IP and a
+// string representation of an IP. If the string is not a valid
+// IP it will fallback to the specified reference.
 func NewIPOpt(ref *net.IP, defaultVal string) *IPOpt {
 	o := &IPOpt{
 		IP: ref,
@@ -20,7 +22,7 @@ func NewIPOpt(ref *net.IP, defaultVal string) *IPOpt {
 }
 
 // Set sets an IPv4 or IPv6 address from a given string. If the given
-// string is not parsable as an IP address it will return an error.
+// string is not parsable as an IP address it returns an error.
 func (o *IPOpt) Set(val string) error {
 	ip := net.ParseIP(val)
 	if ip == nil {
@@ -30,7 +32,7 @@ func (o *IPOpt) Set(val string) error {
 	return nil
 }
 
-// String returns the IP address stored in the IPOpt. If IPOpt is a
+// String returns the IP address stored in the IPOpt. If stored IP is a
 // nil pointer, it returns an empty string.
 func (o *IPOpt) String() string {
 	if *o.IP == nil {
diff --git a/opts/opts.go b/opts/opts.go
index aa8d593b7e..392bc49735 100644
--- a/opts/opts.go
+++ b/opts/opts.go
@@ -27,18 +27,19 @@ var (
 	DefaultUnixSocket = "/var/run/docker.sock"
 )
 
-// ListOpts type that hold a list of values and a validation function.
+// ListOpts holds a list of values and a validation function.
 type ListOpts struct {
 	values    *[]string
 	validator ValidatorFctType
 }
 
-// NewListOpts Create a new ListOpts with the specified validator.
+// NewListOpts creates a new ListOpts with the specified validator.
 func NewListOpts(validator ValidatorFctType) ListOpts {
 	var values []string
 	return *NewListOptsRef(&values, validator)
 }
 
+// NewListOptsRef creates a new ListOpts with the specified values and validator.
 func NewListOptsRef(values *[]string, validator ValidatorFctType) *ListOpts {
 	return &ListOpts{
 		values:    values,
@@ -64,7 +65,7 @@ func (opts *ListOpts) Set(value string) error {
 	return nil
 }
 
-// Delete remove the given element from the slice.
+// Delete removes the specified element from the slice.
 func (opts *ListOpts) Delete(key string) {
 	for i, k := range *opts.values {
 		if k == key {
@@ -85,13 +86,13 @@ func (opts *ListOpts) GetMap() map[string]struct{} {
 	return ret
 }
 
-// GetAll returns the values' slice.
+// GetAll returns the values of slice.
 // FIXME: Can we remove this?
 func (opts *ListOpts) GetAll() []string {
 	return (*opts.values)
 }
 
-// Get checks the existence of the given key.
+// Get checks the existence of the specified key.
 func (opts *ListOpts) Get(key string) bool {
 	for _, k := range *opts.values {
 		if k == key {
@@ -106,7 +107,7 @@ func (opts *ListOpts) Len() int {
 	return len((*opts.values))
 }
 
-//MapOpts type that holds a map of values and a validation function.
+//MapOpts holds a map of values and a validation function.
 type MapOpts struct {
 	values    map[string]string
 	validator ValidatorFctType
@@ -131,6 +132,7 @@ func (opts *MapOpts) Set(value string) error {
 	return nil
 }
 
+// GetAll returns the values of MapOpts as a map.
 func (opts *MapOpts) GetAll() map[string]string {
 	return opts.values
 }
@@ -139,6 +141,7 @@ func (opts *MapOpts) String() string {
 	return fmt.Sprintf("%v", map[string]string((opts.values)))
 }
 
+// NewMapOpts creates a new MapOpts with the specified map of values and a validator.
 func NewMapOpts(values map[string]string, validator ValidatorFctType) *MapOpts {
 	if values == nil {
 		values = make(map[string]string)
@@ -149,13 +152,13 @@ func NewMapOpts(values map[string]string, validator ValidatorFctType) *MapOpts {
 	}
 }
 
-// ValidatorFctType validator that return a validate string and/or an error
+// ValidatorFctType defines a validator function that returns a validated string and/or an error.
 type ValidatorFctType func(val string) (string, error)
 
-// ValidatorFctListType validator that return a validate list of string and/or an error
+// ValidatorFctListType defines a validator function that returns a validated list of string and/or an error
 type ValidatorFctListType func(val string) ([]string, error)
 
-// ValidateAttach Validates that the specified string is a valid attach option.
+// ValidateAttach validates that the specified string is a valid attach option.
 func ValidateAttach(val string) (string, error) {
 	s := strings.ToLower(val)
 	for _, str := range []string{"stdin", "stdout", "stderr"} {
@@ -166,7 +169,7 @@ func ValidateAttach(val string) (string, error) {
 	return val, fmt.Errorf("valid streams are STDIN, STDOUT and STDERR")
 }
 
-// ValidateLink Validates that the specified string has a valid link format (containerName:alias).
+// ValidateLink validates that the specified string has a valid link format (containerName:alias).
 func ValidateLink(val string) (string, error) {
 	if _, _, err := parsers.ParseLink(val); err != nil {
 		return val, err
@@ -194,18 +197,18 @@ func ValidDeviceMode(mode string) bool {
 	return true
 }
 
-// ValidateDevice Validate a path for devices
+// ValidateDevice validates a path for devices
 // It will make sure 'val' is in the form:
 //    [host-dir:]container-path[:mode]
-// It will also validate the device mode.
+// It also validates the device mode.
 func ValidateDevice(val string) (string, error) {
 	return validatePath(val, ValidDeviceMode)
 }
 
-// ValidatePath Validate a path for volumes
+// ValidatePath validates a path for volumes
 // It will make sure 'val' is in the form:
 //    [host-dir:]container-path[:rw|ro]
-// It will also validate the mount mode.
+// It also validates the mount mode.
 func ValidatePath(val string) (string, error) {
 	return validatePath(val, volume.ValidMountMode)
 }
@@ -250,8 +253,8 @@ func validatePath(val string, validator func(string) bool) (string, error) {
 	return val, nil
 }
 
-// ValidateEnv Validate an environment variable and returns it
-// It will use EnvironmentVariableRegexp to ensure the name of the environment variable is valid.
+// ValidateEnv validates an environment variable and returns it.
+// It uses EnvironmentVariableRegexp to ensure the name of the environment variable is valid.
 // If no value is specified, it returns the current value using os.Getenv.
 func ValidateEnv(val string) (string, error) {
 	arr := strings.Split(val, "=")
@@ -267,7 +270,7 @@ func ValidateEnv(val string) (string, error) {
 	return fmt.Sprintf("%s=%s", val, os.Getenv(val)), nil
 }
 
-// ValidateIPAddress Validates an Ip address
+// ValidateIPAddress validates an Ip address.
 func ValidateIPAddress(val string) (string, error) {
 	var ip = net.ParseIP(strings.TrimSpace(val))
 	if ip != nil {
@@ -276,7 +279,7 @@ func ValidateIPAddress(val string) (string, error) {
 	return "", fmt.Errorf("%s is not an ip address", val)
 }
 
-// ValidateMACAddress Validates a MAC address
+// ValidateMACAddress validates a MAC address.
 func ValidateMACAddress(val string) (string, error) {
 	_, err := net.ParseMAC(strings.TrimSpace(val))
 	if err != nil {
@@ -285,8 +288,8 @@ func ValidateMACAddress(val string) (string, error) {
 	return val, nil
 }
 
-// ValidateDNSSearch Validates domain for resolvconf search configuration.
-// A zero length domain is represented by .
+// ValidateDNSSearch validates domain for resolvconf search configuration.
+// A zero length domain is represented by a dot (.).
 func ValidateDNSSearch(val string) (string, error) {
 	if val = strings.Trim(val, " "); val == "." {
 		return val, nil
@@ -305,8 +308,8 @@ func validateDomain(val string) (string, error) {
 	return "", fmt.Errorf("%s is not a valid domain", val)
 }
 
-// ValidateExtraHost Validate that the given string is a valid extrahost and returns it
-// ExtraHost are in the form of name:ip where the ip has to be a valid ip (ipv4 or ipv6)
+// ValidateExtraHost validates that the specified string is a valid extrahost and returns it.
+// ExtraHost are in the form of name:ip where the ip has to be a valid ip (ipv4 or ipv6).
 func ValidateExtraHost(val string) (string, error) {
 	// allow for IPv6 addresses in extra hosts by only splitting on first ":"
 	arr := strings.SplitN(val, ":", 2)
@@ -319,8 +322,8 @@ func ValidateExtraHost(val string) (string, error) {
 	return val, nil
 }
 
-// ValidateLabel Validate that the given string is a valid label, and returns it
-// Labels are in the form on key=value
+// ValidateLabel validates that the specified string is a valid label, and returns it.
+// Labels are in the form on key=value.
 func ValidateLabel(val string) (string, error) {
 	if strings.Count(val, "=") < 1 {
 		return "", fmt.Errorf("bad attribute format: %s", val)
@@ -328,7 +331,7 @@ func ValidateLabel(val string) (string, error) {
 	return val, nil
 }
 
-// ValidateHost Validate that the given string is a valid host and returns it
+// ValidateHost validates that the specified string is a valid host and returns it.
 func ValidateHost(val string) (string, error) {
 	host, err := parsers.ParseHost(DefaultHTTPHost, DefaultUnixSocket, val)
 	if err != nil {