update readme

diff --git a/readme.md b/readme.md
index a032f436a10685a02eebc4ae77d62bfae50cf4e8..e89ec72a286d18e0f90bcc051f7a2d878d06407c 100644 (file)
--- a/readme.md
+++ b/readme.md
@@ -38,7 +38,7 @@ https://support.alarisworld.com/de-de/s2080w-scanner#Software
 
 ```bash
 mkdir build && cd build
-cmake ..
+cmake -DCMAKE_BUILD_TYPE=RELEASE ..
 make
 sudo make install
 ```
@@ -47,7 +47,7 @@ sudo make install
 
 ```bash
 mkdir build && cd build
-cmake ..
+cmake -DCMAKE_BUILD_TYPE=RELEASE ..
 make package
 ```