diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 033175ca7..ee4f26be5 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -5,6 +5,7 @@ TLDR: it works like Github.
 1. Register on the [development website](https://dev.tt-rss.org);
 2. Fork the repository you're interested in;
 3. Do the needful;
+4. Verify that your changes pass through PHPStan (see below);
 4. File a PR against master branch;
 
 If you have any other questions, see this [forum thread](https://discourse.tt-rss.org/t/how-to-contribute-code-via-pull-requests-on-git-tt-rss-org/1850).
@@ -12,6 +13,16 @@ If you have any other questions, see this [forum thread](https://discourse.tt-rs
 Please don't inline patches in forum posts, attach files instead (``.patch`` or ``.diff`` file
 extensions should work).
 
+## PHPStan
+
+Here's an example on how to run the analyzer using Docker:
+
+```sh
+docker run --rm -v $(pwd):/app -v /tmp/phpstan-8.1:/tmp/phpstan --workdir /app php:8.1-cli php -d memory_limit=-1 ./vendor/bin/phpstan --memory-limit=2G --error-format=raw
+```
+
+Any errors break CI pipeline so you'll have to make sure it's clean.
+
 ## Contributing translations
 
 Believe it or not, people also spam using Weblate. Therefore, some minor jumping through hoops is involved here: