diff --git a/src/cchardet/_cchardet.pyx b/src/cchardet/_cchardet.pyx
index c17ddff..f06bb7e 100644
--- a/src/cchardet/_cchardet.pyx
+++ b/src/cchardet/_cchardet.pyx
@@ -66,6 +66,7 @@ cdef class Detector:
         self._detected_charset = ''
 
     def feed(self, char *msg):
+        # TODO: Support py3k
         cdef int length
         cdef int result