diff --git a/docs/index.rst b/docs/index.rst
index bdd5633c3..1602bb60d 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -303,6 +303,8 @@ Mouse features
 * You can also hold down :kbd:`ctrl+shift` and click on a URL to open it in a browser.
 * You can double click to select a word and triple click to select a line.
 * You can right click to extend a previous selection
+* You can hold down :kbd:`ctrl+alt` and drag with the mouse to select in
+  columns
 
 
 Font control