Clarify

Author: Bill-hbrhbr

CMakeLists.txt

@@ -12,6 +12,7 @@ set(CMAKE_EXPORT_COMPILE_COMMANDS
 )
 
 if(YSTDLIB_CPP_IS_TOP_LEVEL)
+    # If previously undefined, `BUILD_TESTING` will be set to ON.
     include(CTest)
 endif()
 

README.md

@@ -8,7 +8,7 @@ An open-source C++ library developed and used at YScope.
 Clone `ystdlib-cpp` into your project. Then, in your project's `CMakeLists.txt`, add the following:
 ```cmake
 # Uncomment the next line if you do not want to build ystdlib-cpp's unit tests.
-# set(YSTDLIB_CPP_BUILD_TESTING OFF)
+# option(YSTDLIB_CPP_BUILD_TESTING "" OFF)
 add_subdirectory(/path/to/ystdlib-cpp EXCLUDE_FROM_ALL)
 target_link_libraries(<target_name> <link_options>
     ystdlib::<lib_1> ystdlib::<lib_2> ... ystdlib::<lib_N>