From 6c51544e56cf4d568d176d0ae5ffa268f07717af Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Wed, 2 Nov 2016 14:24:16 -0600
Subject: [PATCH] Update some comments

---
 include/nuttx/semaphore.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/nuttx/semaphore.h b/include/nuttx/semaphore.h
index 1d0afca38eb..a4bec12cd25 100644
--- a/include/nuttx/semaphore.h
+++ b/include/nuttx/semaphore.h
@@ -61,6 +61,10 @@
 struct inode;
 struct nsem_inode_s
 {
+  /* This must be the first element of the structure.  In sem_close() this
+   * structure must be cast compatible with sem_t.
+   */
+
   sem_t ns_sem;                     /* The contained semaphore */
 
   /* Inode payload unique to named semaphores.  ns_inode must appear first