diff --git a/docs/notes.md b/docs/notes.md
index 766faf4..58bb701 100644
--- a/docs/notes.md
+++ b/docs/notes.md
@@ -2,88 +2,88 @@
 
 1. **BCM pin numbering**
 
-    This library uses Broadcom (BCM) pin numbering for the GPIO pins, as
-    opposed to BOARD. Unlike the `RPi.GPIO` library, this is not configurable.
+   This library uses Broadcom (BCM) pin numbering for the GPIO pins, as
+   opposed to BOARD. Unlike the `RPi.GPIO` library, this is not configurable.
 
-    Any pin marked `GPIO` can be used for generic components.
+   Any pin marked `GPIO` can be used for generic components.
 
-    The BCM pin layout is as follows:
+   The BCM pin layout is as follows:
 
-    |            |            |
-    |-----------:|:-----------|
-    |    3V3     | 5V         |
-    |  **GPIO2** | 5V         |
-    |  **GPIO3** | GND        |
-    |  **GPIO4** | **GPIO14** |
-    |        GND | **GPIO15** |
-    | **GPIO17** | **GPIO18** |
-    | **GPIO27** | GND        |
-    | **GPIO22** | **GPIO23** |
-    |        3V3 | **GPIO24** |
-    | **GPIO10** | GND        |
-    |  **GPIO9** | **GPIO25** |
-    | **GPIO11** | **GPIO8**  |
-    |        GND | **GPIO7**  |
-    |        DNC | DNC        |
-    |  **GPIO5** | GND        |
-    |  **GPIO6** | **GPIO12** |
-    | **GPIO13** | GND        |
-    | **GPIO19** | **GPIO16** |
-    | **GPIO26** | **GPIO20** |
-    |        GND | **GPIO21** |
+   |            |            |
+   |-----------:|:-----------|
+   |    3V3     | 5V         |
+   |  **GPIO2** | 5V         |
+   |  **GPIO3** | GND        |
+   |  **GPIO4** | **GPIO14** |
+   |        GND | **GPIO15** |
+   | **GPIO17** | **GPIO18** |
+   | **GPIO27** | GND        |
+   | **GPIO22** | **GPIO23** |
+   |        3V3 | **GPIO24** |
+   | **GPIO10** | GND        |
+   |  **GPIO9** | **GPIO25** |
+   | **GPIO11** | **GPIO8**  |
+   |        GND | **GPIO7**  |
+   |        DNC | DNC        |
+   |  **GPIO5** | GND        |
+   |  **GPIO6** | **GPIO12** |
+   | **GPIO13** | GND        |
+   | **GPIO19** | **GPIO16** |
+   | **GPIO26** | **GPIO20** |
+   |        GND | **GPIO21** |
 
-    - *GND = Ground*
-    - *3V3 = 3.3 Volts*
-    - *5V = 5 Volts*
-    - *DNC = Do not connect (special use pins)*
+   - *GND = Ground*
+   - *3V3 = 3.3 Volts*
+   - *5V = 5 Volts*
+   - *DNC = Do not connect (special use pins)*
 
 2. **Wiring**
 
-    All components must be wired up correctly before using with this library.
+   All components must be wired up correctly before using with this library.
 
 3. **Keep your program alive with `signal.pause`**
 
-    The following program looks like it should turn an LED on:
+   The following program looks like it should turn an LED on:
 
-    ```python
-    from gpiozero import led
+   ```python
+   from gpiozero import led
 
-    led = LED(2)
+   led = LED(2)
 
-    led.on()
-    ```
+   led.on()
+   ```
 
-    And it does, if you're using the Python shell, IPython shell or IDLE shell,
-    but if you saved this program as a Python file and ran it, it would flash
-    on for a moment then the program would end and it would turn off.
+   And it does, if you're using the Python shell, IPython shell or IDLE shell,
+   but if you saved this program as a Python file and ran it, it would flash
+   on for a moment then the program would end and it would turn off.
 
-    The following file includes an intentional `pause` to keep the program
-    alive:
+   The following file includes an intentional `pause` to keep the program
+   alive:
 
-    ```python
-    from gpiozero import LED
-    from signal import pause
+   ```python
+   from gpiozero import LED
+   from signal import pause
 
-    led = LED(2)
+   led = LED(2)
 
-    led.on()
+   led.on()
 
-    pause()
-    ```
+   pause()
+   ```
 
-    Now running the program will stay running, leaving the LED on, until it is
-    forced to quit.
+   Now running the program will stay running, leaving the LED on, until it is
+   forced to quit.
 
-    Similarly, when setting up callbacks on button presses or other input
-    devices, the program needs to be running for the events to be detected:
+   Similarly, when setting up callbacks on button presses or other input
+   devices, the program needs to be running for the events to be detected:
 
-    ```python
-    from gpiozero import Button
-    from signal import pause
+   ```python
+   from gpiozero import Button
+   from signal import pause
 
-    button = Button(2)
+   button = Button(2)
 
-    button.when_pressed = lambda: print("Button was pressed!")
+   button.when_pressed = lambda: print("Button was pressed!")
 
-    pause()
-    ```
+   pause()
+   ```