diff --git a/d2common/d2input/doc.go b/d2common/d2input/doc.go
new file mode 100644
index 00000000..748f1262
--- /dev/null
+++ b/d2common/d2input/doc.go
@@ -0,0 +1,2 @@
+// Package d2input provides common input management logic
+package d2input
diff --git a/d2common/d2input/input_vector.go b/d2common/d2input/input_vector.go
index a3d98616..fbc817e3 100644
--- a/d2common/d2input/input_vector.go
+++ b/d2common/d2input/input_vector.go
@@ -2,6 +2,7 @@ package d2input
 
 import "github.com/gravestench/akara"
 
+// NewInputVector creates a new input vector
 func NewInputVector() *InputVector {
 	v := &InputVector{
 		KeyVector:         akara.NewBitSet(),
@@ -12,60 +13,71 @@ func NewInputVector() *InputVector {
 	return v.Clear()
 }
 
+// InputVector represents the state of keys, modifiers, and mouse buttons.
+// It can be used to compare input states, and is intended to be used as such:
+// 		* whatever manages system input keeps a "current" input vector and updates it
+//  	* things that are listening for certain inputs will be compared using `Contains` and `Intersects` methods
 type InputVector struct {
 	KeyVector         *akara.BitSet
 	ModifierVector    *akara.BitSet
 	MouseButtonVector *akara.BitSet
 }
 
+// SetKey sets the corresponding key bit in the keys bitset
 func (iv *InputVector) SetKey(key Key) *InputVector {
 	return iv.SetKeys([]Key{key})
 }
 
+// SetKeys sets multiple key bits in the keys bitset
 func (iv *InputVector) SetKeys(keys []Key) *InputVector {
 	if len(keys) == 0 {
 		return iv
 	}
 
 	for _, key := range keys {
-		iv.KeyVector.Set(int(key), true)
+		iv.KeyVector.Set(key, true)
 	}
 
 	return iv
 }
 
+// SetModifier sets the corresponding modifier bit in the modifier bitset
 func (iv *InputVector) SetModifier(mod Modifier) *InputVector {
 	return iv.SetModifiers([]Modifier{mod})
 }
 
+// SetModifiers sets multiple modifier bits in the modifier bitset
 func (iv *InputVector) SetModifiers(mods []Modifier) *InputVector {
 	if len(mods) == 0 {
 		return iv
 	}
 
 	for _, key := range mods {
-		iv.ModifierVector.Set(int(key), true)
+		iv.ModifierVector.Set(key, true)
 	}
 
 	return iv
 }
 
+// SetMouseButton sets the corresponding mouse button bit in the mouse button bitset
 func (iv *InputVector) SetMouseButton(button MouseButton) *InputVector {
 	return iv.SetMouseButtons([]MouseButton{button})
 }
 
+// SetMouseButtons sets multiple mouse button bits in the mouse button bitset
 func (iv *InputVector) SetMouseButtons(buttons []MouseButton) *InputVector {
 	if len(buttons) == 0 {
 		return iv
 	}
 
 	for _, key := range buttons {
-		iv.MouseButtonVector.Set(int(key), true)
+		iv.MouseButtonVector.Set(key, true)
 	}
 
 	return iv
 }
 
+// Contains returns true if this input vector is a superset of the given input vector
 func (iv *InputVector) Contains(other *InputVector) bool {
 	keys := iv.KeyVector.ContainsAll(other.KeyVector)
 	buttons := iv.MouseButtonVector.ContainsAll(other.MouseButtonVector)
@@ -76,6 +88,7 @@ func (iv *InputVector) Contains(other *InputVector) bool {
 	return keys && mods && buttons
 }
 
+// Intersects returns true if this input vector shares any bits with the given input vector
 func (iv *InputVector) Intersects(other *InputVector) bool {
 	keys := iv.KeyVector.Intersects(other.KeyVector)
 	mods := iv.ModifierVector.Intersects(other.ModifierVector)
@@ -84,6 +97,7 @@ func (iv *InputVector) Intersects(other *InputVector) bool {
 	return keys || mods || buttons
 }
 
+// Clear sets all bits in this input vector to 0
 func (iv *InputVector) Clear() *InputVector {
 	iv.KeyVector.Clear()
 	iv.ModifierVector.Clear()
diff --git a/d2common/d2input/keys.go b/d2common/d2input/keys.go
index a41ebe47..71d7e18a 100644
--- a/d2common/d2input/keys.go
+++ b/d2common/d2input/keys.go
@@ -2,8 +2,10 @@ package d2input
 
 import "github.com/hajimehoshi/ebiten/v2"
 
+// Key represents a keyboard key
 type Key = int
 
+// Keys
 const (
 	Key0            = Key(ebiten.Key0)
 	Key1            = Key(ebiten.Key1)
diff --git a/d2common/d2input/modifiers.go b/d2common/d2input/modifiers.go
index 8b893059..4adab848 100644
--- a/d2common/d2input/modifiers.go
+++ b/d2common/d2input/modifiers.go
@@ -2,8 +2,10 @@ package d2input
 
 import "github.com/hajimehoshi/ebiten/v2"
 
+// Modifier represents a keyboard modifier key
 type Modifier = int
 
+// Modifiers
 const (
 	ModAlt     = Modifier(ebiten.KeyAlt)
 	ModControl = Modifier(ebiten.KeyControl)
diff --git a/d2common/d2input/mouse_buttons.go b/d2common/d2input/mouse_buttons.go
index e9ee53d7..cb51ddd5 100644
--- a/d2common/d2input/mouse_buttons.go
+++ b/d2common/d2input/mouse_buttons.go
@@ -2,8 +2,10 @@ package d2input
 
 import "github.com/hajimehoshi/ebiten/v2"
 
+// MouseButton represents a button on a mouse
 type MouseButton = int
 
+// MouseButtons
 const (
 	MouseButtonLeft   = MouseButton(ebiten.MouseButtonLeft)
 	MouseButtonRight  = MouseButton(ebiten.MouseButtonRight)