Update README.md

README.md

@@ -18,7 +18,7 @@ This is a sample Project which includes a CMake verion of the scg3 library.
 Run following commands in the library directory (e.g. `extern/`) to add the library.
 
 ```
-git submodule add https://lab.it.hs-hannover.de/3nw-kux-u1/scg3_cmake scg3
+git submodule add https://lab.it.hs-hannover.de/3nw-kux-u1/scg3_cmake.git scg3
 git submodule init
 git submodule update
 git submodule update --init --recursive