diff --git a/.gitignore b/.gitignore
index 9d4e86ab10ca..ff8da185a9ee 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,6 +6,8 @@
 # as most of those are useless.
 #==============================================================================#
 
+install
+
 #==============================================================================#
 # File extensions to be ignored anywhere in the tree.
 #==============================================================================#
diff --git a/README.md b/README.md
index a9b29ecbc1a3..cb101670f0aa 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,19 @@
+## Doomhowl Interactive - Cheatsheet
+
+```console
+cmake -S llvm -B build -G Ninja \
+  -DCMAKE_INSTALL_PREFIX=$(pwd)/install \
+  -DCMAKE_BUILD_TYPE=RelWithDebInfo \
+  -DCMAKE_C_COMPILER=clang-21 \
+  -DCMAKE_CXX_COMPILER=clang++-21 \
+  -DLLVM_ENABLE_PROJECTS="clang;lld;clang-tools-extra;lldb" \
+  -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi;compiler-rt;libunwind" \
+  -DLLVM_USE_LINKER=mold
+  
+cmake --build build --parallel
+cmake --build build --target install
+```
+
 # The LLVM Compiler Infrastructure
 
 [![OpenSSF Scorecard](https://api.securityscorecards.dev/projects/github.com/llvm/llvm-project/badge)](https://securityscorecards.dev/viewer/?uri=github.com/llvm/llvm-project)