diff --git a/CMakeLists.txt b/CMakeLists.txt
index c355026a..48917eba 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,7 +7,7 @@ endif()
 option(JAPANESE "Enable the Japanese-language build" OFF)
 option(FIX_BUGS "Fix certain bugs (see src/Bug Fixes.txt)" OFF)
 option(NONPORTABLE "Enable bits of code that aren't portable, but are what the original game used" OFF)
-option(FORCE_LOCAL_LIBS "Ignore system libraries, and compile the statically-linked local copies instead" OFF)
+option(FORCE_LOCAL_LIBS "Compile the built-in versions of SDL2, FreeType, and FLTK instead of using the system-provided ones" OFF)
 
 # Default to Release build
 if(NOT CMAKE_BUILD_TYPE)
diff --git a/README.md b/README.md
index 74317f3c..fa19c238 100644
--- a/README.md
+++ b/README.md
@@ -28,8 +28,10 @@ cmake .. -DCMAKE_BUILD_TYPE=Release
 ```
 
 You can also add the following flags:
-* `-DJAPANESE=On` - Enable the Japanese-language build (instead of the unofficial Aeon Genesis English translation)
-* `-DFIX_BUGS=On` - Fix bugs in the game (see [src/Bug Fixes.txt](src/Bug%20Fixes.txt))
+* `-DJAPANESE=ON` - Enable the Japanese-language build (instead of the unofficial Aeon Genesis English translation)
+* `-DFIX_BUGS=ON` - Fix bugs in the game (see [src/Bug Fixes.txt](src/Bug%20Fixes.txt))
+* `-DNONPORTABLE=ON` - Enable bits of code that aren't portable, but are what the original game used
+* `-DFORCE_LOCAL_LIBS=ON` - Compile the built-in versions of SDL2, FreeType, and FLTK instead of using the system-provided ones
 
 Then compile CSE2 with this command: