diff --git a/Documentation/NuttxUserGuide.html b/Documentation/NuttxUserGuide.html
index 48be3bee85..4efacd9fd7 100644
--- a/Documentation/NuttxUserGuide.html
+++ b/Documentation/NuttxUserGuide.html
@@ -1492,7 +1492,8 @@ This parameter is required but not used in the present
 implementation.
 <LI><I>value</I>.  The value parameter is type unsigned int.  The semaphore
 is created with an initial value of <I>value</I>.  Valid initial values for
-semaphores must be less than or equal to <I>SEM_MAX_VALUE</I>.
+semaphores must be less than or equal to <I>SEM_VALUE_MAX</I> (defined in
+<CODE>include/limits.h</CODE>).
 </UL>
 </UL>
 
@@ -2406,18 +2407,11 @@ in the si_code member. The content of si_value is only meaningful
 if the signal was generated by sigqueue(). The following values
 for si_code are defined in signal.h:
 <UL>
-<LI>Standard:
-<UL>
-<LI><I>SI_QUEUE</I>. Signal sent from sigqueue
-<LI><I>SI_MESGQ</I>. Signal generated by arrival of a message
-on an empty message queue
-</UL>
-
-<LI>Unique to this implementation:
-<UL>
-<LI><I>SI_TIMEOUT</I>. No Signal, restarted by timeout
-</UL>
-
+  <LI><I>SI_USER</I>. Signal sent from kill, raise, or abort
+  <LI><I>SI_QUEUE</I>. Signal sent from sigqueue
+  <LI><I>SI_TIMER</I>. Signal is result of timer expiration
+  <LI><I>SI_ASYNCIO</I>. Signal is the result of asynch IO completion 
+  <LI><I>SI_MESGQ</I>. Signal generated by arrival of a message on an empty message queue.
 </UL>
 
 <P>