diff --git a/doc/manual.html b/doc/manual.html
index 62d1801c8df90e43f6be9abd8b6b27a4e9cdc66e..3c1d2fe0323245da69fcc39e98e9bef147dd44bd 100644
--- a/doc/manual.html
+++ b/doc/manual.html
@@ -1859,7 +1859,7 @@ editor.setOption("extraKeys", {
       position that the cursor would have when it would sit at that
       position.</dd>
       <dt id="coordsChar"><code><strong>cm.coordsChar</strong>(object: {left, top}, ?mode: string) → {line, ch}</code></dt>
-      <dd>Given an <code>{left, top}</code> object, returns
+      <dd>Given an <code>{left, top}</code> object (e.g. coordinates of a mouse event) returns
       the <code>{line, ch}</code> position that corresponds to it. The
       optional <code>mode</code> parameter determines relative to what
       the coordinates are interpreted. It may