diff --git a/README.md b/README.md
index b10958bc7131ba2bbc3d21fe19886b1800365a82..50b3b3e93bb669746ac099e53348f02e87c00f01 100644
--- a/README.md
+++ b/README.md
@@ -514,7 +514,6 @@ Represents a rectangular block. Scaled down version of the previous `Block`, opt
- **Notes**:
-
**Private Function Members**
N/A
@@ -540,68 +539,305 @@ Todo
### EventLogger ([event_logger.hpp](include/event_logger.hpp), [event_logger.cpp](src/event_logger.cpp))
**Description**
-Todo
+Logs events directly from the `Toolbox` and sorts them by type in 16-deep circular buffers. Used exclusively for debugging.
**Usage**
-Todo
+- Construct object
+- Once the events are collected in the `Toolbox`, call `push_events`
+- Convert `Pevent`s to strings using `ptos`
**Constructors and Destructors**
-Todo
+- `EventLogger()`
+- `EventLogger(const EventLogger&)`
**Public Function Members**
-Todo
+- `void push_events(Toolbox&)`
+
+ - **Description**:
+
+ Catch events from `Toolbox`
+
+ - **Preconditions**:
+
+ New events have been captured by the `Toolbox`
+
+ - **Postconditions**:
+
+ The events have been sorted into their corresponding circular buffer
+
+ - **Notes**:
+
+ N/A
+
+
+**Non-Member Functions**
+
+- `std::string ptos(const Pevent&, const Toolbox&)`
+
+ - **Description**:
+
+ Convert a `Pevent` to a `std::string`.
+
+ - **Preconditions**:
+
+ N/A
+
+ - **Postconditions**:
+
+ Returns a `std::string` that describes the `Pevent`.
+
+ - **Notes**:
+
+ The `Toolbox` argument is used for coordinate transformation.
+
**Private Function Members**
-Todo
+N/A
**Public Data Members**
-Todo
+- `unsigned i_down, i_up, i_move, i_other`
+
+ Index where next event is to be inserted.
+
+- `std::array<Pevent, 16> events_down`
+
+ Events of down-type.
+
+- `std::array<Pevent, 16> events_up`
+
+ Events of up-type.
+
+- `std::array<Pevent, 16> events_move`
+
+ Events of move-type.
+
+- `std::array<Pevent, 16> events_other`
+
+ Events of other-type.
+
**Private Data Members**
-Todo
+N/A
**Notes**
-Todo
+N/A
### GuiHandler ([gui_handler.hpp](include/gui_handler.hpp), [gui_handler.cpp](src/gui_handler.cpp))
**Description**
-Todo
+Draws and controls all functionality related to the GUI.
**Usage**
-Todo
+- Construct object with fraction of screen occupied by the gui
+- Call `init` with a `Toolbox` that has a fully initialized `Infrastructure`
+- In each frame, call
+ - `update` to queue drawing and update state
+ - `render` to draw the GUI before swapping screen buffers
**Constructors and Destructors**
-Todo
+- `GuiHandler(float)`
**Public Function Members**
-Todo
+- `void init(Toolbox& tb, const std::string path_img, const std::string path_ttf)`
+
+ - **Description**:
+
+ Initialize all GUI related infrastructure
+
+ - **Preconditions**:
+
+ Fully setup `Toolbox`
+
+ - **Postconditions**:
+
+ Fonts and images have been loaded, ImGui is fully initialized.
+
+ - **Notes**:
+
+
+
+- `void update(Toolbox& tb)`
+
+ - **Description**:
+
+ Update the GUI
+
+ - **Preconditions**:
+
+ N/A
+
+ - **Postconditions**:
+
+ Tasks performed:
+ - Check if application has to quit and handle this
+ - Check if there is a new finger that controls the GUI, or if the controlling finger was released
+ - Handle any input to the GUI, pass it on to ImGui for processing
+ - Construct the GUI
+
+ - **Notes**:
+
+ N/A
+
+- `void render(Toolbox& tb)`
+
+ - **Description**:
+
+ Render the GUI to the screenbuffer.
+
+ - **Preconditions**:
+
+ N/A
+
+ - **Postconditions**:
+
+ The GUI is drawn on the screenbuffer.
+
+ - **Notes**:
+
+ N/A
+
**Private Function Members**
-Todo
+- `bool isInGuiWindow_(const Pevent&) const`
+
+ - **Description**:
+
+ Check if a `Pevent` is within the GUI window.
+
+ - **Preconditions**:
+
+ N/A
+
+ - **Postconditions**:
+
+ Returns `true` if the `Pevent` is within the GUI window, `false` else.
+
+ - **Notes**:
+
+ N/A
+
+- `void draw_gui_(Toolbox& tb)`
+
+ - **Description**:
+
+ Construct a semi-old version of the GUI
+
+ - **Preconditions**:
+
+ All resources have been loaded
+
+ - **Postconditions**:
+
+ N/A
+
+ - **Notes**:
+
+ N/A
+
+- `void draw_gui_ft_(Toolbox& tb)`
+
+ - **Description**:
+
+ Construct the GUI used at FocusTerra
+
+ - **Preconditions**:
+
+ All resources have been loaded.
+
+ - **Postconditions**:
+
+ N/A
+
+ - **Notes**:
+
+ N/A
+
+- `void draw_old_gui_(Toolbox& tb)`
+
+ - **Description**:
+
+ Construct the old GUI.
+
+ - **Preconditions**:
+
+ All resources have been loaded
+
+ - **Postconditions**:
+
+ N/A
+
+ - **Notes**:
+
+ N/A
+
+- `void load_button_textures_(const std::string path)`
+
+ - **Description**:
+
+ Load all necessary images into textures.
+
+ - **Preconditions**:
+
+ All images can be found in `path`, and they all have the correct format.
+
+ - **Postconditions**:
+
+ All images have been uploaded to the GPU as textures and can be accessed with the corresponding private members `btex_*_*`.
+
+ - **Notes**:
+
+ N/A
+
+- `void load_image_to_texture_(const std::string file, GLuint& texture)`
+
+ - **Description**:
+
+ Load an image (rgba) from file into an OpenGL texture using stbi.
+
+ - **Preconditions**:
+
+ The target image has format RGBA
+
+ - **Postconditions**:
+
+ The image has been uploaded to the GPU as a texture, and its handle has been copied into the address specified by `texture`
+
+ - **Notes**:
+
+
+
**Public Data Members**
-Todo
+N/A
**Private Data Members**
-Todo
+- `float gui_pos_`: Portion of screen occupied by GUI
+- `ImGuiIO io_`: ImGui IO object
+- `SDL_Event next_event_`: Next event for event chains that span several frames (raising, lowering finger)
+- `SDL_FingerID fingerID_`: Finger currently controlling the GUI
+- `SDL_TouchID deviceID_`: ID of the currently connected touch device (read: touchscreen)
+- `bool lowering_finger_`: Are we in the event chain of lowering a finger?
+- `bool raising_finger_`: Are we in the event chain of raising a finger?
+- `ImFont* font_`: Font used by ImGui
+- `GLuint btex_*_on, btex_*_off`: 12 OpenGL texture handles corresponding to images drawn in GUI
+- `EventLogger evlog`: EventLogger, only present while debugging
**Notes**
-Todo
+N/A
### Infrastructure ([infrastructure.hpp](include/infrastructure.hpp), [infrastructure.cpp](src/infrastructure.cpp))
**Description**