diff --git a/tests/README.md b/tests/README.md
index af650a2565..c8962dedc1 100644
--- a/tests/README.md
+++ b/tests/README.md
@@ -9,3 +9,17 @@ Of course this is all just very high-level and things like
 unit tests would be much better. So if you have time and know
 how to set up a unit testing framework for python, please do
 give it a try.
+
+When adding entries in test_.yaml files we usually need only
+one file updated, unless conflicting code is generated for
+different configurations, e.g. `wifi` and `ethernet` cannot
+be tested on the same device.
+
+Current test_.yaml file contents.
+
+| Test name | Platform | Network |
+|-|-|-|
+| test1.yaml | ESP32 | wifi |
+| test2.yaml | ESP32 | ethernet |
+| test3.yaml | ESP8266 | wifi |
+| test4.yaml | ESP32 | ethernet |