diff --git a/kernel/acct.c b/kernel/acct.c
index fce53d8df8a7ade114a002885a8cbfc1cdbedc49..cf19547cc9e42d346c49b0e51e89aa5fb19364d6 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -413,7 +413,7 @@ static u32 encode_float(u64 value)
  *  The acct_process() call is the workhorse of the process
  *  accounting system. The struct acct is built here and then written
  *  into the accounting file. This function should only be called from
- *  do_exit().
+ *  do_exit() or when switching to a different output file.
  */
 
 /*