diff --git a/init-latex.el b/init-latex.el
index 7531b99..1f1f676 100644
--- a/init-latex.el
+++ b/init-latex.el
@@ -25,11 +25,14 @@
 (add-hook 'LaTeX-mode-hook (lambda ()
 			     (turn-on-auto-fill)
 			     (subword-mode)
+			     ;; Move around commands in the Right Way™
 			     (modify-syntax-entry ?\\ "w" LaTeX-mode-syntax-table)
 			     (setq subword-forward-regexp "\\W*\\(\\([\\\\[:upper:]]*\\W?\\)[[:lower:][:digit:]]*\\)")
 			     (setq subword-backward-regexp "\\(\\(\\W\\|[[:lower:][:digit:]]\\)\\([\\\\[:upper:]]+\\W*\\)\\|\\W\\w+\\)")
+			     ;; FIXME: this breaks sourcepair for other modes.
 			     (setq sourcepair-source-extensions '(".tex"))
 			     (setq sourcepair-header-extensions '(".p.tex"))
+
 			     (define-key LaTeX-mode-map (kbd "C-c C-v")
 			       (lambda (arg)
 				 (interactive "P")