diff --git a/NOTES.txt b/NOTES.txt
index fb6de22b0..5e2721700 100644
--- a/NOTES.txt
+++ b/NOTES.txt
@@ -3041,6 +3041,45 @@ qmake confusions:
    - equals() to compare equality, it will be compared as QString, in qmake everything is QString
 
 
+GitHub Actions confusions:
+--------------------------
+
+ - matrix include/exclude with objects:
+
+I finally got it, I always used arrays in include/exclude and this is wrong, it must be object
+
+matrix:
+  lto: [ ON, OFF ]
+  drivers-type: [ Shared, Loadable, Static ]
+  build-type:
+    - key: debug
+      name: Debug
+    - key: release
+      name: Release
+  exclude|include:
+    - lto: ON
+      drivers-type: Static
+      build-type:
+        key: release
+        name: Release
+
+So it must be object and NOT array of object:
+build-type:
+  key: release
+  name: Release
+
+Or:
+build-type: { key: release, name: Release }
+
+Previous BAD definition I tried in include/exclude:
+  exclude:
+    - lto: ON
+      drivers-type: Static
+      build-type:
+        - key: release
+          name: Release
+
+
 tools/deploy.ps1:
 -----------------