diff --git a/docs/build.md b/docs/build.md
index 46aafabd9..bdde2e3ac 100644
--- a/docs/build.md
+++ b/docs/build.md
@@ -16,36 +16,47 @@ make vendor
 ```
 
 Install the required packages, depending on your operating system.
+
 * __Debian/Ubuntu__:
+
   ```sh
-  sudo apt-get update
   sudo apt-get install scons libsdl2-dev libsdl2-image-dev
   ```
+
 * __Fedora__:
+
   ```sh
   sudo yum install scons SDL2-devel SDL2_image-devel
   ```
+
 * __OpenSUSE__:
+
   ```sh
   sudo zypper install scons libSDL2-devel libSDL2_image-devel
   ```
+
 * __Arch__:
+
   ```sh
   sudo pacman -S scons sdl2 sdl2_image
   ```
+
 * __Mac OS X__:
+
   ```sh
   brew install scons sdl2 sdl2_image
   ```
+
 * __Windows__: not supported yet, sorry.
 
-
 Run the build with:
+
 ```sh
 make build_unix
 ```
 
 Now you can start the emulator:
+
 ```sh
 ./emu.sh
 ```
diff --git a/docs/hardware.md b/docs/hardware.md
index 0c81e0d9b..f2667b5d2 100644
--- a/docs/hardware.md
+++ b/docs/hardware.md
@@ -101,6 +101,7 @@
 * Integrated STMicroelectronics ST-LINK/V2.1 debugger
 
 Minimum MCU requirements:
+
 * STM32F4 family [STM32F427VIT6](http://www.st.com/en/microcontrollers/stm32f427vi.html)
 * 168 MHz, 8 MHz HSE
 * 2048 KB Flash memory
@@ -112,4 +113,3 @@ Minimum MCU requirements:
 #### Clock Tree
 
 ![Clock Tree](hardware/clock-tree.png)
-
diff --git a/docs/testing.md b/docs/testing.md
index 776b593f6..531519809 100644
--- a/docs/testing.md
+++ b/docs/testing.md
@@ -7,14 +7,19 @@ Apart from the internal tests, Trezor core has a suite of integration tests in t
 ### 1. Running the suite with pipenv
 
 [`pipenv`](https://docs.pipenv.org/) is a tool for making reproducible Python environments. Install it with:
+
 ```sh
 sudo pip3 install pipenv
 ```
+
 Inside `trezor-core` checkout, install the environment:
+
 ```sh
 pipenv install
 ```
+
 And run the automated tests:
+
 ```sh
 pipenv run make test_emu
 ```
@@ -22,37 +27,48 @@ pipenv run make test_emu
 ### 2. Developing new tests
 
 You will need a separate checkout of `python-trezor`. It's probably a good idea to do this outside the `trezor-core` directory:
+
 ```sh
 git clone https://github.com/trezor/python-trezor
 ```
+
 Prepare a virtual environment with all the requirements, and switch into it. Again, it's easiest to do this with `pipenv`:
+
 ```sh
 cd python-trezor
 pipenv install -r requirements-dev.txt
 pipenv install -e .
 pipenv shell
 ```
+
 Alternately, if you have an existing virtualenv, you can install python-trezor in "develop" mode:
+
 ```sh
 python setup.py develop
 ```
 
 If you want to test against the emulator, run it in a separate terminal from the `trezor-core` checkout directory:
+
 ```sh
 PYOPT=0 ./emu.sh
 ```
 
 Find the device address and export it as an environment variable. For the emulator, this is:
+
 ```sh
 export TREZOR_PATH="udp:127.0.0.1:21324"
 ```
+
 (You can find other devices with `trezorctl list`.)
 
 Now you can run the test suite, either from `python-trezor` or `trezor-core` root directory:
+
 ```sh
 pytest
 ```
+
 Or from anywhere else:
+
 ```sh
 pytest --pyargs trezorlib.tests.device_tests  # this works from other locations
 ```
@@ -60,6 +76,7 @@ pytest --pyargs trezorlib.tests.device_tests  # this works from other locations
 You can place your own tests in `trezorlib/tests/device_tests`. See test style guide (TODO).
 
 If you only want to run a particular test, pick it with `-k <keyword>` or `-m <marker>`:
+
 ```sh
 pytest -k nem      # only runs tests that have "nem" in the name
 pytest -m stellar  # only runs tests marked with @pytest.mark.stellar
@@ -76,9 +93,12 @@ When you're happy with your tests, follow these steps:
    If you want to run that test as usual, run `pytest --runxfail`
 3. Submit a PR to `python-trezor`, containing these tests.
 4. Edit the file `trezor-core/pytest.ini`, and add your marker to the `run_xfail` item:
-   ```
+
+   ``` ini
    run_xfail = lisk nem ultracoin2000
    ```
+
    This will cause your PR to re-enable the `xfail`ed tests. That way we will see whether your feature actually implements what it claims.
+
 5. Submit a PR to `trezor-core`.
 6. Optionally, if you like to be extra nice: after both your PRs are accepted, submit a new one to `python-trezor` that removes the `xfail` markers, and one to `trezor-core` that removes the `run_xfail` entry.