diff --git a/py/mpconfig.h b/py/mpconfig.h
index 2ba5f1acf2..edf6e71d0e 100644
--- a/py/mpconfig.h
+++ b/py/mpconfig.h
@@ -590,7 +590,7 @@ typedef double mp_float_t;
 #define MICROPY_PY_ASYNC_AWAIT (1)
 #endif
 
-// Support for async/await/async for/async with
+// Issue a warning when comparing str and bytes objects
 #ifndef MICROPY_PY_STR_BYTES_CMP_WARN
 #define MICROPY_PY_STR_BYTES_CMP_WARN (0)
 #endif