diff --git a/documentation/RELEASE_NOTES.html b/documentation/RELEASE_NOTES.html
index 4f9f38a9b..447cb04a6 100644
--- a/documentation/RELEASE_NOTES.html
+++ b/documentation/RELEASE_NOTES.html
@@ -12,7 +12,8 @@
 
 <h2 align="center">Changes since 3.14.6</h2>
 <h4>POSIX signals</h4>
-<p>Signals are blocked in all but the main thread.</p>
+<p>Signals are blocked in all but the main thread.  Applications/drivers 
+which require signal delivery to a subthread will need to be modified.</p>
 
 <h4>errlog</h4>
 <p>errlog now calls atexit and releases all resources when process exits.</p>