diff --git a/BFLibCore/BFLibCore.fsproj b/BFLibCore/BFLibCore.fsproj
new file mode 100644
index 0000000..df45432
--- /dev/null
+++ b/BFLibCore/BFLibCore.fsproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Include="Library.fs" />
+  </ItemGroup>
+
+</Project>
diff --git a/BFLibCore/Library.fs b/BFLibCore/Library.fs
new file mode 100644
index 0000000..7970d2f
--- /dev/null
+++ b/BFLibCore/Library.fs
@@ -0,0 +1,5 @@
+namespace BFLibCore
+
+module Say =
+    let hello name =
+        printfn "Hello %s" name
diff --git a/BrittleFish.sln b/BrittleFish.sln
index 0040ddf..d6c8643 100644
--- a/BrittleFish.sln
+++ b/BrittleFish.sln
@@ -9,6 +9,8 @@ Project("{F2A71F9B-5D33-465A-A702-920D77279786}") = "BFLib", "BFLib\BFLib.fsproj
 EndProject
 Project("{F2A71F9B-5D33-465A-A702-920D77279786}") = "BrittleFishCore", "BrittleFishCore\BrittleFishCore.fsproj", "{F70A49CF-9272-49C4-91D9-91A14EC7E741}"
 EndProject
+Project("{F2A71F9B-5D33-465A-A702-920D77279786}") = "BFLibCore", "BFLibCore\BFLibCore.fsproj", "{C3D653BC-7FF8-4C2F-841E-1101AD5E59D6}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -27,6 +29,10 @@ Global
 		{F70A49CF-9272-49C4-91D9-91A14EC7E741}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{F70A49CF-9272-49C4-91D9-91A14EC7E741}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{F70A49CF-9272-49C4-91D9-91A14EC7E741}.Release|Any CPU.Build.0 = Release|Any CPU
+		{C3D653BC-7FF8-4C2F-841E-1101AD5E59D6}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C3D653BC-7FF8-4C2F-841E-1101AD5E59D6}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C3D653BC-7FF8-4C2F-841E-1101AD5E59D6}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C3D653BC-7FF8-4C2F-841E-1101AD5E59D6}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE