From 656df6ddd6b5231705798540c347efeebf8ac8a9 Mon Sep 17 00:00:00 2001
From: Loek Le Blansch <loek@pipeframe.xyz>
Date: Mon, 11 Nov 2024 15:52:43 +0100
Subject: update contributing.md

---
 contributing.md | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/contributing.md b/contributing.md
index 8799057..a80f2b4 100644
--- a/contributing.md
+++ b/contributing.md
@@ -652,6 +652,20 @@ that you can click on to open them.
   bool bar = 0;
   ```
   </td></tr></table></details>
+- <details><summary>
+  The reason for <code>friend</code> relations are documented
+  </summary><table><tr><th>Good</th><th>Bad</th></tr><tr><td>
+
+  ```cpp
+  //! ComponentManager calls the private constructor of this class
+  friend class ComponentManager;
+  ```
+  </td><td>
+
+  ```cpp
+  friend class ComponentManager;
+  ```
+  </td></tr></table></details>
 
 ## CMakeLists-specific
 
-- 
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