Update CHANGES for PR #2551

Author: jfbu

CHANGES

@@ -63,6 +63,7 @@ Bugs fixed
 * #2558: unpack error on devhelp builder
 * #2561: Info builder crashes when a footnote contains a link
 * #2565: The descriptions of objects generated by ``sphinx.ext.autosummary`` overflow lines at LaTeX writer
+* Extend pdflatex config in sphinx.sty to subparagraphs (ref: #2551)
 
 
 Release 1.4.1 (released Apr 12, 2016)