diff --git a/CHANGELOG.md b/CHANGELOG.md
index b6da886..205d8db 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@
 - `./runtests` test runner with coverage tracking by default
 - testing on OS X
 - testing on Windows
+- `Int64Flag` type and supporting code
 
 ### Changed
 - Use spaces for alignment in help/usage output instead of tabs, making the
diff --git a/context_test.go b/context_test.go
index 7625c5b..ae37637 100644
--- a/context_test.go
+++ b/context_test.go
@@ -13,7 +13,7 @@ func TestNewContext(t *testing.T) {
 	set.Float64("myflag64", float64(17), "doc")
 	globalSet := flag.NewFlagSet("test", 0)
 	globalSet.Int("myflag", 42, "doc")
-	globalSet.Int("myflagInt64", 42, "doc")
+	globalSet.Int64("myflagInt64", int64(42), "doc")
 	globalSet.Float64("myflag64", float64(47), "doc")
 	globalCtx := NewContext(nil, globalSet, nil)
 	command := Command{Name: "mycommand"}
diff --git a/flag.go b/flag.go
index abeff90..6af15ed 100644
--- a/flag.go
+++ b/flag.go
@@ -189,7 +189,7 @@ func (f *IntSlice) Set(value string) error {
 
 // String returns a readable representation of this value (for usage defaults)
 func (f *IntSlice) String() string {
-	return fmt.Sprintf("%d", *f)
+	return fmt.Sprintf("%#v", *f)
 }
 
 // Value returns the slice of ints set by this flag
@@ -260,7 +260,7 @@ func (f *Int64Slice) Set(value string) error {
 
 // String returns a readable representation of this value (for usage defaults)
 func (f *Int64Slice) String() string {
-	return fmt.Sprintf("%d", *f)
+	return fmt.Sprintf("%#v", *f)
 }
 
 // Value returns the slice of ints set by this flag
@@ -447,7 +447,6 @@ func (f StringFlag) GetName() string {
 }
 
 // IntFlag is a flag that takes an integer
-// Errors if the value provided cannot be parsed
 type IntFlag struct {
 	Name        string
 	Value       int
@@ -492,7 +491,6 @@ func (f IntFlag) GetName() string {
 }
 
 // Int64Flag is a flag that takes a 64-bit integer
-// Errors if the value provided cannot be parsed
 type Int64Flag struct {
 	Name        string
 	Value       int64
@@ -582,7 +580,6 @@ func (f DurationFlag) GetName() string {
 }
 
 // Float64Flag is a flag that takes an float value
-// Errors if the value provided cannot be parsed
 type Float64Flag struct {
 	Name        string
 	Value       float64