diff --git a/README.md b/README.md
index 5b8d0f4..d542093 100644
--- a/README.md
+++ b/README.md
@@ -1,21 +1,42 @@
 # Anm2ed
 
-Reimplementation of *The Binding of Isaac: Rebirth*'s proprietary animation editor; dealing with manipulating the XML-based ".anm2" format.
+![Preview](https://shweetz.net/https://shweetz.net/files/projects/anm2ed/preview.png)
+
+A reimplementation of *The Binding of Isaac: Rebirth*'s proprietary animation editor. Manipulates the XML-based ".anm2" format, used for in-game tweened animations.
+
+## Features
+
+- Most things present in the original IsaacAnimationEditor.exe, except some stuff like drawing (why not use an art program!)
+- Smooth [Dear ImGui](https://github.com/ocornut/imgui) interface; docking, dragging and dropping, etc.
+- Keybinds/keyboard control for common actions(see [src/input.h](https://github.com/ShweetsStuff/anm2ed/blob/master/src/input.h))
+
+### To do
+- Windows release
+- Undo queue
+- GIF export
+- Some other things I can't think of
+
+### Known Issues
+- Root Transform doesn't work for scale/rotation (matrix math is hard; if you can help me fix it I will give you $100.)
+- Some .anm2 files used in Rebirth might not render correctly due to the ordering of layers; just drag and drop to fix the ordering and save, they will work fine afterwards. 
+- On startup, you will have to configure the windows yourself.
+- Probably several bugs that elude me
+
+## Dependencies
+Download these from your package manager:
 
-# Dependencies
 - SDL3
 - GLEW
 
-# Build
+## Build
 
-After cloning, make sure to initialize the submodules:
+After cloning and enter the repository's directory, make sure to initialize the submodules:
 
 ```git submodules update --init```
 
 Then:
 
 ```
-
 mkdir build
 
 cd build
diff --git a/src/imgui.cpp b/src/imgui.cpp
index 4f9a094..75a9129 100644
--- a/src/imgui.cpp
+++ b/src/imgui.cpp
@@ -1842,6 +1842,7 @@ imgui_init
     Preview* preview,
     Settings* settings,
     Tool* tool,
+    UndoStack* undoStack,
     SDL_Window* window,
     SDL_GLContext* glContext
 )
@@ -1859,6 +1860,7 @@ imgui_init
 	self->preview = preview;
 	self->settings = settings;
 	self->tool = tool;
+	self->undoStack = undoStack;
 	self->window = window;
 	self->glContext = glContext;
 
@@ -1923,6 +1925,9 @@ imgui_tick(Imgui* self)
 
 	_imgui_taskbar(self);
 	_imgui_dock(self);
+
+	if (key_press(&self->input->keyboard, INPUT_KEYS[INPUT_UNDO]))
+		undo_stack_pop(self->undoStack, self->anm2);
 }
 
 void
diff --git a/src/imgui.h b/src/imgui.h
index 20192f3..7256107 100644
--- a/src/imgui.h
+++ b/src/imgui.h
@@ -8,6 +8,7 @@
 #include "input.h"
 #include "settings.h"
 #include "tool.h"
+#include "undo_stack.h"
 
 #define IMGUI_IMPL_OPENGL_LOADER_CUSTOM
 #define IMGUI_ENABLE_DOCKING
@@ -100,6 +101,7 @@ struct Imgui
     Preview* preview = NULL;
     Settings* settings = NULL;
     Tool* tool = NULL;
+    UndoStack* undoStack = NULL;
     SDL_Window* window = NULL;
     SDL_GLContext* glContext = NULL;
     bool isSwap = false;
@@ -121,6 +123,7 @@ imgui_init
     Preview* preview,
     Settings* settings,
     Tool* tool,
+    UndoStack* undoStack,
     SDL_Window* window,
     SDL_GLContext* glContext
 );
diff --git a/src/input.h b/src/input.h
index fa216a3..3f3f687 100644
--- a/src/input.h
+++ b/src/input.h
@@ -233,7 +233,7 @@ enum KeyType
         KEY_RGUI = 231
 };
 
-#define INPUT_COUNT (INPUT_ZOOM_OUT + 1)
+#define INPUT_COUNT (INPUT_UNDO + 1)
 enum InputType
 {
     INPUT_PAN,
@@ -247,7 +247,8 @@ enum InputType
     INPUT_ROTATE_LEFT,
     INPUT_ROTATE_RIGHT,
     INPUT_ZOOM_IN,
-    INPUT_ZOOM_OUT
+    INPUT_ZOOM_OUT,
+    INPUT_UNDO
 };
 
 static const KeyType INPUT_KEYS[INPUT_COUNT]
@@ -263,7 +264,8 @@ static const KeyType INPUT_KEYS[INPUT_COUNT]
     KEY_Q,
     KEY_W,
     KEY_1,
-    KEY_2
+    KEY_2,
+    KEY_Z
 };
 
 struct Keyboard
diff --git a/src/snapshots.cpp b/src/snapshots.cpp
new file mode 100644
index 0000000..689f8d9
--- /dev/null
+++ b/src/snapshots.cpp
@@ -0,0 +1,24 @@
+#include "undo_stack.h"
+
+void 
+undo_stack_push(Snapshots* self, Anm2* anm2)
+{
+    if (self->top >= UNDO_STACK_MAX)
+    {
+        memmove(&self->snapshots[0], &self->snapshots[1], sizeof(Anm2) * (UNDO_STACK_MAX - 1));
+        self->top = UNDO_STACK_MAX - 1;
+    }
+
+    self->snapshots[self->top++] = *anm2;
+}
+
+bool
+undo_stack_pop(Snapshots* self, Anm2* anm2)
+{
+    if (self->top == 0)
+        return false;
+
+    *anm2 = self->snapshots[--self->top];
+
+    return true;
+}
\ No newline at end of file
diff --git a/src/snapshots.h b/src/snapshots.h
new file mode 100644
index 0000000..1ce90ef
--- /dev/null
+++ b/src/snapshots.h
@@ -0,0 +1,22 @@
+#pragma once
+
+#include "anm2.h"
+
+#define SNAPSHOT_STACK_MAX 100
+
+struct SnapshotStack
+{
+    Anm2 snapshots[SNAPSHOT_STACK_MAX];
+    s32 top = 0;
+};
+
+struct Snapshots
+{
+    SnapshotStack undoStack;
+    SnapshotStack redoStack;
+}
+
+
+
+void undo_stack_push(UndoStack* self, Anm2* anm2);
+bool undo_stack_pop(UndoStack* self, Anm2* anm2);
\ No newline at end of file
diff --git a/src/state.cpp b/src/state.cpp
index 53e44d3..4674229 100644
--- a/src/state.cpp
+++ b/src/state.cpp
@@ -143,6 +143,7 @@ init(State* state)
 		&state->preview,
 		&state->settings,
 		&state->tool,
+		&state->undoStack,
 		state->window,
 		&state->glContext
 	);
diff --git a/src/state.h b/src/state.h
index 440ab8a..65245be 100644
--- a/src/state.h
+++ b/src/state.h
@@ -22,6 +22,7 @@ struct State
 	Resources resources;
 	Settings settings;
 	Tool tool;
+	UndoStack undoStack;
 	bool isArgument = false;
 	bool isRunning = true;
 	char argument[PATH_MAX] = STRING_EMPTY;