diff --git a/en_US.ISO8859-1/htdocs/releases/12.0R/relnotes/relnotes.xml b/en_US.ISO8859-1/htdocs/releases/12.0R/relnotes/relnotes.xml
index c33f503142..74f211113c 100644
--- a/en_US.ISO8859-1/htdocs/releases/12.0R/relnotes/relnotes.xml
+++ b/en_US.ISO8859-1/htdocs/releases/12.0R/relnotes/relnotes.xml
@@ -414,6 +414,11 @@
     <sect2 xml:id="userland-abi">
       <title>ABI Compatibility</title>
 
+      <para revision="337992">The &man.pthread.3; library has been
+	updated to incorporate
+	<acronym>POSIX</acronym>/<acronym>SUSv4</acronym>-2018
+	compliance improvements.</para>
+
       <para revision="338331">The &man.arc4random.3; library has been
 	updated to remove <function>arc4random_stir()</function> and
 	<function>arc4random_addrandom()</function>.</para>