changes: document bigendian UTF-16/UTF-32 support

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
diff --git a/doc/changes.src b/doc/changes.src
index d6a9977..ed47bec 100644
--- a/doc/changes.src
+++ b/doc/changes.src
@@ -45,6 +45,8 @@
 \b Add support for x32 ELF (32-bit ELF with the CPU in 64-bit mode.)
    See \k{elffmt}.
 
+\b Add support for bigendian UTF-16 and UTF-32.  See \k{unicode}.
+
 \S{cl-2.09.10} Version 2.09.10
 
 \b Fix up NSIS script to protect uninstaller against registry keys