Update README.md

README.md

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 # lem-opengl
 
-This is a frontend for lem. 
+This is a frontend for [lem](https://github.com/cxxxr/lem). 
 It is based on the ncurses frontend.
 It renders lem to an OpenGL texture, making it easy to use in OpenGL enabled apps. 
 Input and windowing is handled by [https://github.com/terminal625/sucle](https://github.com/terminal625/sucle) which is not yet available on quicklisp.