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-rw-r--r--docs/development/contributing_guide.md6
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diff --git a/docs/development/contributing_guide.md b/docs/development/contributing_guide.md
index cb0d727efa..5c37225168 100644
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+++ b/docs/development/contributing_guide.md
@@ -167,6 +167,12 @@ was broken. They are slower than the linters but will typically catch more error
 poetry run trial tests
 ```
 
+You can run unit tests in parallel by specifying `-jX` argument to `trial` where `X` is the number of parallel runners you want. To use 4 cpu cores, you would run them like:
+
+```sh
+poetry run trial -j4 tests
+```
+
 If you wish to only run *some* unit tests, you may specify
 another module instead of `tests` - or a test class or a method: