diff --git a/libc/include/malloc.h b/libc/include/malloc.h
index eba18a8..aa046b9 100644
--- a/libc/include/malloc.h
+++ b/libc/include/malloc.h
@@ -125,7 +125,8 @@
 
 /**
  * [mallinfo(3)](http://man7.org/linux/man-pages/man3/mallinfo.3.html) returns
- * information about the current state of the heap.
+ * information about the current state of the heap. Note that mallinfo() is
+ * inherently unreliable and consider using malloc_info() instead.
  */
 struct mallinfo mallinfo(void);