Add comment to highlighter about using normalize()
See issue #80
diff --git a/packages/dom/src/highlight-range.ts b/packages/dom/src/highlight-range.ts
index 0dfa38f..e7b9b8e 100644
--- a/packages/dom/src/highlight-range.ts
+++ b/packages/dom/src/highlight-range.ts
@@ -21,7 +21,7 @@
// Wrap each text node in a given DOM Range with a <mark> or other element.
// Breaks start and/or end node if needed.
// Returns a function that cleans up the created highlight (not a perfect undo: split text nodes are
-// not merged again).
+// not merged again; if desired, you could run range.commonAncestorContainer.normalize() afterwards).
//
// Parameters:
// - range: a DOM Range object. Note that as highlighting modifies the DOM, the range may be
