changes.src: document Mach-O alignment fix.
diff --git a/doc/changes.src b/doc/changes.src
index 0a44844..f593b14 100644
--- a/doc/changes.src
+++ b/doc/changes.src
@@ -23,6 +23,8 @@
 
 \b Correct the arguments to the \c{POPCNT} instruction.
 
+\b Fix section alignment in the Mach-O format.
+
 
 \S{cl-2.05.01} Version 2.05.01