diff --git a/documentation/RELEASE_NOTES.html b/documentation/RELEASE_NOTES.html
index e1c9ca6b2..d74e4538c 100644
--- a/documentation/RELEASE_NOTES.html
+++ b/documentation/RELEASE_NOTES.html
@@ -18,6 +18,10 @@
 <h2>Changes since 3.14.3</h2>
 </center>
 
+<h4>Format string checking</h4</h4>
+<p>'printf-style' functions like errlogPrintf have their arguments verified
+against their format string when compiled with gcc.</p>
+
 <h4>IOC shell command-line editing on vxWorks</h4>
 
 <p>The IOC shell now uses the vxWorks ledLib routines so command-line editing