diff --git a/INSTALL.md b/INSTALL.md
index c8f44f61..b93a9e1c 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -50,7 +50,7 @@ git clone https://github.com/epoupon/lms.git lms
 cd lms
 mkdir build
 cd build
-cmake .. -DCMAKE_BUILD_TYPE=Release
+cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr
 ```
 __Notes__:
 * you can customize the installation directory using `-DCMAKE_INSTALL_PREFIX=path` (defaults to `/usr/local`).