diff --git a/Keyboard-Shortcuts.md b/Keyboard-Shortcuts.md
index bd9d3fd..07ae36f 100644
--- a/Keyboard-Shortcuts.md
+++ b/Keyboard-Shortcuts.md
@@ -13,5 +13,6 @@ The default keyboard shortcuts are:
 - <kbd>ESC</kbd>, <kbd>O</kbd>: Slide overview / Escape from full-screen
 - <kbd>S</kbd>: Speaker notes view
 - <kbd>?</kbd>: Show keyboard shortcuts
+- <kbd>alt</kbd> + click: Zoom in. Repeat to zoom back out.
 
 These can be overridden; see `Readme.md`.
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