diff --git a/include/stdio.h b/include/stdio.h
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -81,12 +81,6 @@
 
 #define	_FSTDIO			/* Define for new stdio with functions. */
 
-/*
- * NB: to fit things in six character monocase externals, the stdio
- * code uses the prefix `__s' for stdio objects, typically followed
- * by a three-character attempt at a mnemonic.
- */
-
 /* stdio buffers */
 struct __sbuf {
 	unsigned char *_base;