Suggest the command git submodule update --init

CMakeLists.txt

@@ -66,7 +66,7 @@ endif()
 if(NOT IS_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/louloulibs" OR
     NOT EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/louloulibs/CMakeLists.txt")
   message(FATAL_ERROR "louloulibs/ not found or empty. Make sure you fetched
-  the submodules with 'git submodule init && git submodule update'")
+  the submodules with 'git submodule update --init'")
 endif()
 add_subdirectory("louloulibs")
 include_directories("louloulibs")