diff --git a/README.md b/README.md
index e9d5616..2eacf4b 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,10 @@
 
 ## Installation
 
+This project is build using .NET 9, with SixLabors.ImageSharp as the only external library.
+Please refer to [install dotnet SDK on Debian](https://learn.microsoft.com/en-us/dotnet/core/install/linux-debian?tabs=dotnet9)
+for details.
+
 ### 1. Build
 
 Install dependencies:
@@ -9,7 +13,7 @@ Install dependencies:
 wget https://packages.microsoft.com/config/debian/12/packages-microsoft-prod.deb
 sudo dpkg -i packages-microsoft-prod.deb
 sudo apt update
-sudo apt install -y dotnet-sdk-8.0
+sudo apt install -y dotnet-sdk-9.0
 ```
 
 Build the project in `App` folder using command:
@@ -24,8 +28,13 @@ After publishing, enter the folder `/publish` then run
 ./StitchATon2.App
 ```
 
-## Approach
+## Ideas
+
 Since we only serve a static assets and the output is downscale only, I think it's good to pre-process each image to [image integral](https://en.wikipedia.org/wiki/Summed-area_table) first and then save it to another directory (eg. temp).
 
 Later, we can apply Box Filter averaging on the fly to output Stream (HttpResponse).
 
+## Approach
+
+This project is heavily depends on Memory Mapped File to reduce processing overhead and memory pressure to allow HTTP serve more request.
+The MMF is used to store the Image Integral of provided asset.
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