doc: changes -- Add CLZERO into the list

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
diff --git a/doc/changes.src b/doc/changes.src
index 4f7020e..3bca35a 100644
--- a/doc/changes.src
+++ b/doc/changes.src
@@ -14,6 +14,8 @@
 
 \b Fix error when not specifying a list file.
 
+\b Add the \c{CLZERO} instruction.
+
 
 \S{cl-2.12} Version 2.12