diff --git a/bool.go b/bool.go
index 37ce019..85e1c1d 100644
--- a/bool.go
+++ b/bool.go
@@ -36,7 +36,7 @@ func (b *boolValue) String() string {
 //  --option=true
 //  --o=false
 //
-// Its value is case insenstive and one of true, false, t, f, on, off, t and 0.
+// Its value is case insensitive and one of true, false, t, f, on, off, t and 0.
 func Bool(name rune, helpvalue ...string) *bool {
 	return CommandLine.Bool(name, helpvalue...)
 }
diff --git a/error.go b/error.go
index 3de8e86..75eb6fb 100644
--- a/error.go
+++ b/error.go
@@ -31,11 +31,11 @@ const (
 func (e ErrorCode) String() string {
 	switch e {
 	case UnknownOption:
-		return "unknow option"
+		return "unknown option"
 	case MissingParameter:
 		return "missing argument"
 	case ExtraParameter:
-		return "unxpected value"
+		return "unexpected value"
 	case Invalid:
 		return "error setting value"
 	}
@@ -61,7 +61,7 @@ func unknownOption(name interface{}) *Error {
 }
 
 // missingArg returns an Error inidicating option o was not passed
-// a required paramter.
+// a required parameter.
 func missingArg(o Option) *Error {
 	return &Error{
 		ErrorCode: MissingParameter,
@@ -71,7 +71,7 @@ func missingArg(o Option) *Error {
 }
 
 // extraArg returns an Error inidicating option o was passed the
-// unexpected paramter value.
+// unexpected parameter value.
 func extraArg(o Option, value string) *Error {
 	return &Error{
 		ErrorCode: ExtraParameter,
diff --git a/getopt.go b/getopt.go
index 755500b..69006ab 100644
--- a/getopt.go
+++ b/getopt.go
@@ -162,7 +162,7 @@
 //
 // The difference bentween Foo and FooVar is that you pass a pointer, p, to the
 // location of the value to FooVar.  The default value is simply *p.  The
-// initial value of *p is the defaut value of the option.
+// initial value of *p is the default value of the option.
 //
 // Foo is actually a wrapper around FooVar:
 //
@@ -400,7 +400,7 @@ func (s *Set) Parse(args []string) {
 // Getopt returns nil when all options have been processed (a non-option
 // argument was encountered, "--" was encountered, or fn returned false).
 //
-// On error getopt returns a refernce to an InvalidOption (which implements
+// On error getopt returns a reference to an InvalidOption (which implements
 // the error interface).
 func (s *Set) Getopt(args []string, fn func(Option) bool) (err error) {
 	s.State = InProgress
diff --git a/list.go b/list.go
index b9d4267..96bde5d 100644
--- a/list.go
+++ b/list.go
@@ -24,7 +24,7 @@ func (s *listValue) String() string {
 }
 
 // List creates an option that returns a slice of strings.  The parameters
-// passed are converted from a comma seperated value list into a slice.
+// passed are converted from a comma separated value list into a slice.
 // Subsequent occurrences append to the list.
 func List(name rune, helpvalue ...string) *[]string {
 	return CommandLine.List(name, helpvalue...)
@@ -46,7 +46,7 @@ func (s *Set) ListLong(name string, short rune, helpvalue ...string) *[]string {
 	return &p
 }
 
-// ListVar creats a list option and places the values in p.  If p is pointing
+// ListVar creates a list option and places the values in p.  If p is pointing
 // to a list of values then those are considered the default values.  The first
 // time name is seen in the options the list will be set to list specified by
 // the parameter to the option.  Subsequent instances of the option will append
diff --git a/option.go b/option.go
index 17dbe58..1e856c7 100644
--- a/option.go
+++ b/option.go
@@ -43,7 +43,7 @@ type Option interface {
 	// SetFlag makes the value a flag.  Flags are boolean values and
 	// normally do not taken a value.  They are set to true when seen.
 	// If a value is passed in the long form then it must be on, case
-	// insenstive, one of "true", "false", "t", "f", "on", "off", "1", "0".
+	// insensitive, one of "true", "false", "t", "f", "on", "off", "1", "0".
 	// SetFlag returns the Option
 	SetFlag() Option
 
diff --git a/set.go b/set.go
index 64d9ecf..3c78c36 100644
--- a/set.go
+++ b/set.go
@@ -27,7 +27,7 @@ const (
 type Set struct {
 	State // State of getopt
 
-	// args are the parameters remaining after parsing the optoins.
+	// args are the parameters remaining after parsing the options.
 	args []string
 
 	// program is the name of the program for usage and error messages.
diff --git a/v2/error.go b/v2/error.go
index 6f668a3..5177903 100644
--- a/v2/error.go
+++ b/v2/error.go
@@ -31,11 +31,11 @@ const (
 func (e ErrorCode) String() string {
 	switch e {
 	case UnknownOption:
-		return "unknow option"
+		return "unknown option"
 	case MissingParameter:
 		return "missing argument"
 	case ExtraParameter:
-		return "unxpected value"
+		return "unexpected value"
 	case Invalid:
 		return "error setting value"
 	}
@@ -61,7 +61,7 @@ func unknownOption(name interface{}) *Error {
 }
 
 // missingArg returns an Error inidicating option o was not passed
-// a required paramter.
+// a required parameter.
 func missingArg(o Option) *Error {
 	return &Error{
 		ErrorCode: MissingParameter,
@@ -71,7 +71,7 @@ func missingArg(o Option) *Error {
 }
 
 // extraArg returns an Error inidicating option o was passed the
-// unexpected paramter value.
+// unexpected parameter value.
 func extraArg(o Option, value string) *Error {
 	return &Error{
 		ErrorCode: ExtraParameter,
diff --git a/v2/getopt.go b/v2/getopt.go
index e5c52bf..a2876ed 100644
--- a/v2/getopt.go
+++ b/v2/getopt.go
@@ -175,7 +175,7 @@
 //	getopt.Flag(&a, 'b', "use method B").SetGroup("method")
 //
 // A set can have multiple mutually exclusive groups.  Mutually exclusive groups
-// are identified with their group name in {}'s appeneded to their help message:
+// are identified with their group name in {}'s appended to their help message:
 //
 //	 -a    use method A {method}
 //	 -b    use method B {method}
diff --git a/v2/set.go b/v2/set.go
index 9f73ede..b151871 100644
--- a/v2/set.go
+++ b/v2/set.go
@@ -29,7 +29,7 @@ type Set struct {
 	stateMu sync.Mutex
 	state   State
 
-	// args are the parameters remaining after parsing the optoins.
+	// args are the parameters remaining after parsing the options.
 	args []string
 
 	// program is the name of the program for usage and error messages.