diff --git a/README.md b/README.md
index 12d23de..744c799 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ For capturing games outside Flatpak runtime, you need native build regardless of
 ## Building
 
     mkdir build && cd build
-    cmake -DCMAKE_INSTALL_PREFIX=/usr ..
+    cmake -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=Release ..
     make && make install
 
 ## Usage