diff --git a/docs/abra/hack.md b/docs/abra/hack.md
index df99043..8ae197f 100644
--- a/docs/abra/hack.md
+++ b/docs/abra/hack.md
@@ -24,10 +24,21 @@ Please use the [conventional commit format](https://www.conventionalcommits.org/
 
 We use [`bats`](https://bats-core.readthedocs.io/en/stable/), you can install
 the required dependencies with the following. You also need a working
-installation of Docker and Go.
+installation of Docker and Go (not covered in this section).
 
 ```
-apt install bats bats-file bats-assert bats-support jq make git
+apt install bats-file bats-assert bats-support jq make git
+```
+
+Unfortunately, the latest `bats` version in Debian stable does not have the
+"filter tests by tags" feature, which is very handy for running a subset of the
+tests. For this, we need to install `bats` from source. It's easy:
+
+```
+apt purge -y bats
+git clone https://github.com/bats-core/bats-core.git
+cd bats-core
+sudo ./install.sh /usr/local
 ```
 
 Then you can run the integration test suite with the following:
@@ -44,22 +55,18 @@ It's advised that you re-use the same server and therefore the same Traefik
 deployment for running your integration tests. Then you'll have more stable
 results.
 
-If you're hacking on the tests, you can speed things up with the following.
-
-```
-export ABRA_SKIP_TEARDOWN=1
-```
-
-This will avoid nuking `$ABRA_DIR` for each test which avoids the costly `git
-clone` of the catalogue on each test run. For the actual CI testing, we
-probably want this clean slate on each test to avoid confusion.
-
 You can filter on test names to run specific kinds of tests.
 
 ```
 bats tests/integration --filter "validate app argument"
 ```
 
+You can filter on tags also.
+
+```
+bats tests/integration --filter-tags fast
+```
+
 ## Using the `abra` public API
 
 Warning, there is currently no stability promise for the `abra` public API! Most of the internals are exposed in order to allow a free hand for developers to try build stuff. If people start to build things then we can start the discussion on what is useful to have open/closed and keep stable etc. Please let us know if you depend on the APIs!