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diff --git a/README b/README
index b70309eb92..0061c398e5 100644
--- a/README
+++ b/README
@@ -388,6 +388,7 @@ Command Line Options:
         --multi-midi   - enable combination Adlib and native MIDI
         --native-mt32  - true Roland MT-32 (disable GM emulation)
         --aspect-ratio - enable aspect ratio correction
+        --demo-mode    - Start demo mode of Maniac Mansion (Classic version)
         --floppy-intro - Use floppy version intro for Beneath a Steel Sky CD
 
 The meaning of long options can be inversed by prefixing them with "no-", e.g.