diff --git a/documentation/RELEASE_NOTES.html b/documentation/RELEASE_NOTES.html
index b32e93e21..ee2cf4c60 100644
--- a/documentation/RELEASE_NOTES.html
+++ b/documentation/RELEASE_NOTES.html
@@ -13,6 +13,15 @@
 
 <!-- Insert new items below here ... -->
 
+<h4>Added compile line header search directories</h4>
+
+<p>The compile line list of directories to search for header files now
+includes O.Common and the existing os subdirectories of SRC_DIRS
+&lt;src_dir&gt;/os/&lt;OS_CLASS&gt;, &lt;src_dir&gt;/os/posix, and 
+&lt;src_dir&gt;/os/default.
+</p>
+
+
 <h4>GNU make multiple jobs now supported</h4>
 
 <p>The "-j jobs" option is now supported for users of GNU make version 3.80