diff --git a/README.md b/README.md
index 2c2b6d6..bc70660 100644
--- a/README.md
+++ b/README.md
@@ -46,20 +46,15 @@ syntax highlighting.
 
 ### Does syntax highlighting work during incremental history search?
 
-Highlighting the command line during an incremental history search
-(with the `history-incremental-search-backward` widget, which is
-bound by default to <kbd>Ctrl+R</kbd> in zsh's emacs keymap) requires zsh 5.3
+Highlighting the command line during an incremental history search, which is
+bound by default to <kbd>Ctrl+R</kbd> in zsh's emacs keymap, requires zsh 5.3.2
 or newer.
 
-Under zsh 5.2 and older, the zsh-default [underlining][zshzle-Character-Highlighting]
-of the matched portion of the buffer remains available, but zsh-syntax-highlighting's
-additional highlighting is unavailable.  (Those versions of zsh do not provide
-enough information to allow computing the highlighting correctly.)
-
-See [issue #288][i288] for details.
+See [issue #288][i288] and [issue #415][i415] for details.
 
 [zshzle-Character-Highlighting]: http://zsh.sourceforge.net/Doc/Release/Zsh-Line-Editor.html#Character-Highlighting
 [i288]: https://github.com/zsh-users/zsh-syntax-highlighting/pull/288
+[i415]: https://github.com/zsh-users/zsh-syntax-highlighting/pull/415
 
 ### How are new releases announced?