diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5b0a0ae..4b013d4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,7 +10,7 @@ endif()
 set(SRCS
     src/Main.cpp)
 
-set(CMAKE_CXX_FLAGS "-std=c++14 -fno-elide-constructors -pedantic-errors -Wall -Wextra -Werror -Wpedantic -Winit-self -Wmissing-declarations -Wuninitialized -Wfatal-errors")
+set(CMAKE_CXX_FLAGS "-std=c++14 -fopenmp -fno-elide-constructors -pedantic-errors -Wall -Wextra -Werror -Wpedantic -Winit-self -Wmissing-declarations -Wuninitialized -Wfatal-errors")
 set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS} -O3")
 set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS} -g -O0")
 set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS} -g -O3")
diff --git a/README.md b/README.md
index 197a001..3d8df55 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ Indivisible is an optimized prime number generator written in C++.
 
 Building
 --------
-This project uses CMake to build.
+This project uses CMake to build and depends on OpenMP.
 
 ```bash
 $ cd build/