diff --git a/release/doc/share/xml/release.ent b/release/doc/share/xml/release.ent
index 5cc3c859e7bc..4e7709ab1304 100644
--- a/release/doc/share/xml/release.ent
+++ b/release/doc/share/xml/release.ent
@@ -71,6 +71,7 @@
 <!ENTITY arch.mips "mips">
 <!ENTITY arch.pc98 "pc98">
 <!ENTITY arch.powerpc "powerpc">
+<!ENTITY arch.powerpc64 "powerpc64">
 <!ENTITY arch.sparc64 "sparc64">
 
 <!-- The marker for MFCs. -->