Update README.md

Author: cas4ey

README.md

@@ -8,7 +8,7 @@ so `std::allocator` can be easily replaced by `salloc::shared_allocator` (or by
 1. Copy files `include/shared_allocator/*.*` to your include directory 
     (for example, `include/third_party/shared_allocator` or just `include/shared_allocator`).
 2. Copy files `source/*.*` to your sources directory (for example, `source/shared_allocator`).
-3. Include `source/shared_allocator/CMakeLists.txt` into your main CMakeLists.txt: `add_subdirectory(source/shared_allocator)`
+3. Include `source/shared_allocator/CMakeLists.txt` (from step 2) into your main CMakeLists.txt: `add_subdirectory(source/shared_allocator)`
 4. Add path to shared_allocator header files into additional include directories: `include_directories(include/third_party)`
     to make it possible for your compiler to find includes like `#include "shared_allocator/shared_allocator.hpp"`.
 5. Add link to shared_allocator library into every project's CMakeLists.txt that would be using `salloc::shared_allocator<T>`