diff --git a/examples/picol.c b/examples/picol.c
index ef4ba2c34..ca135e4eb 100644
--- a/examples/picol.c
+++ b/examples/picol.c
@@ -25,16 +25,19 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+/*
+ * Original from http://oldblog.antirez.com/page/picol.html
+ * Changes on 2021-12-27 by octetta :
+ * . Use Cosmopolitan's headers.
+ * . Formatted as per Cosmopolitan's standards.
+ */
+
 #include <libc/log/log.h>
 #include <libc/stdio/stdio.h>
 
 #include "libc/fmt/conv.h"
 #include "libc/fmt/fmt.h"
 
-//#include <stdio.h>
-//#include <stdlib.h>
-//#include <string.h>
-
 enum { PICOL_OK, PICOL_ERR, PICOL_RETURN, PICOL_BREAK, PICOL_CONTINUE };
 enum { PT_ESC, PT_STR, PT_CMD, PT_VAR, PT_SEP, PT_EOL, PT_EOF };