diff --git a/README.md b/README.md
index 01f17cd..b7503f1 100644
--- a/README.md
+++ b/README.md
@@ -53,6 +53,7 @@ Tools are distributed in directories:
 
 <details open>
   <summary>Files layout</summary>
+    Content structure overview with notes
     <pre>
     ├── PerfSPEC.pdf                   Reference document
     ├── README.md