Updated README

The automatically chosen build type is Debug if the repository is
cloned.

1 files changed, 1 insertions, 1 deletions

diff --git a/README.md b/README.md
index 21252dc6..11b12077 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ This is how to build Lagrange in a Unix-like environment. The required tools are
 1. Download and extract a source tarball from [Releases][rel]. Alternatively, you may also clone the repository and its submodules: `git clone --recursive --branch release https://git.skyjake.fi/skyjake/lagrange`
 2. Check that you have the dependencies installed: CMake, SDL 2, OpenSSL 1.1.1, libpcre, zlib, libunistring. For example, on macOS this would do the trick (using Homebrew): ```brew install cmake sdl2 openssl@1.1 pcre libunistring``` Or on Ubuntu: ```sudo apt install cmake libsdl2-dev libssl-dev libpcre3-dev zlib1g-dev libunistring-dev```
 3. Create a build directory.
-4. In your empty build directory, run CMake: ```cmake {path_of_lagrange_sources}```
+4. In your empty build directory, run CMake: ```cmake {path_of_lagrange_sources} -DCMAKE_BUILD_TYPE=Release```
 5. Build it: ```cmake --build .```
 6. Now you can run `lagrange`, `lagrange.exe`, or `Lagrange.app`.