"Stephen J. Turnbull" <turnbull(a)sk.tsukuba.ac.jp&gt; writes: It's not. The ChangeLog is only a guide that tells you what part of the code changed, and the reason, but it is almost never sufficient to understand the extent of the change. You have to look at the patch for that. It's a bug. Nothing more, nothing less. Not an intrinsic problem with elisp, or anything like that. I try to accompany each patch with a rationale why the patch is needed and a description what the patch does. This does not apply to all the patches, though. If I had done that for my "isearch FSF merge" patch, I would have written a novel. But yes, I think a careful reader of xemacs-patches should find it very instructive. I think it takes more than twenty-five words. But less than a hundred. :-)