diff --git a/collects/scribble/html-render.rkt b/collects/scribble/html-render.rkt
index 1f25ea9c..3976cd66 100644
--- a/collects/scribble/html-render.rkt
+++ b/collects/scribble/html-render.rkt
@@ -1396,9 +1396,9 @@
            (if m
              (list* (substring i 0 (cdar m))
                     ;; Most browsers wrap after a hyphen. The one that
-                    ;; doesn't, Firefox, pays attention to wbr. Some
-                    ;; browsers ignore wbr, but at least they don't do
-                    ;; strange things with it.
+                    ;; doesn't, Firefox, pays attention to wbr.  But
+                    ;; almost all browsers pay attention to zero width
+                    ;; space, so we'll insert one here.
                     #x200b
                     (render-other (substring i (cdar m)) part ri))
              (ascii-ize i)))]