diff --git a/MartianRobots.sln b/MartianRobots.sln
index 26291ac..1054eb3 100644
--- a/MartianRobots.sln
+++ b/MartianRobots.sln
@@ -17,6 +17,7 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MartianRobots.Web.Shared",
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{66F192C6-D936-400A-8137-F3AFFB3CCE6E}"
 	ProjectSection(SolutionItems) = preProject
+		NET_-_Martian_Robots_Updated.pdf = NET_-_Martian_Robots_Updated.pdf
 		README.md = README.md
 	EndProjectSection
 EndProject
diff --git a/NET_-_Martian_Robots_Updated.pdf b/NET_-_Martian_Robots_Updated.pdf
new file mode 100644
index 0000000..eae66d8
Binary files /dev/null and b/NET_-_Martian_Robots_Updated.pdf differ
diff --git a/README.md b/README.md
index c0ba0ad..e794271 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,10 @@
 # README file
 
-## 1. Running the solver - CLI
+## 1. Problem definition
+
+please read [NET_-_Martian_Robots_Updated.pdf](NET_-_Martian_Robots_Updated.pdf) file
+
+## 2. Running the solver - CLI
 
 run project MartianRobots.Web.Server
 local dev computer - CLI
@@ -11,17 +15,17 @@ dotnet run --project .\MartianRobots.Web\Server\MartianRobots.Web.Server.csproj
 
 then browse <http://localhost:5003>
 
-## 2. Running the solver - Docker
+## 3. Running the solver - Docker
 
 ```sh
 docker run -p 5050:80 --name martianrobots clodyx/martianrobotswebserver
 ```
 
-## 3. Projects structure
+## 4. Projects structure
+
 	MartianRobotsSolver - problem solver library
 	MartianRobotsSolver.Tests - unit tests for solver
 	MartianRobots.Api -  a simple web api for quick use
 	MartianRobots.Web.Server - blazor WASM app with .net web api
 	MartianRobots.Web.Client - WASM app for blazor
 	MartianRobots.Web.Shared - shared project for blazor
-