diff --git a/Development-Testing-Release.md b/Development-Testing-Release.md
index 2969d0a..87e3e1a 100644
--- a/Development-Testing-Release.md
+++ b/Development-Testing-Release.md
@@ -33,6 +33,15 @@ git clean -fdx
 flake8
 ```
 
+### Particular defined test
+
+Option -k <pattern> can be used to select specific sub-tests
+
+Example:
+```
+pytest radicale/tests/test_base.py [-k test_overwrite_collection]
+```
+
 ### Complete test suite
 
 Note: in case of strange errors add option `-r` for recreation of environment