diff --git a/README.md b/README.md
index eaa19031..2ef20f75 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,7 @@ Cave Story Engine 2 is a decompilation of Cave Story, ported from DirectX to SDL
 * SDL2
 * FreeType
 * FLTK
+* GLEW (if the OpenGL backend is selected) (not currently built with CMake)
 
 ## Building