diff --git a/README.md b/README.md
index 31013dc8..f51f9aec 100644
--- a/README.md
+++ b/README.md
@@ -6,3 +6,7 @@ with operator overloading.
 In honour of Marian Rejewski, a Polish mathematician and
 cryptologist.
 
+    mkdir build
+    cd build
+    cmake ..
+    make -j