From 7a686cb48ac9cd12cdcfe396332d0f5fc47d4a13 Mon Sep 17 00:00:00 2001
From: Paolo Capriotti <paolo@capriotti.io>
Date: Sat, 17 Apr 2021 12:24:18 +0200
Subject: [PATCH] Add note about disambiguation quirk (#419)

---
 README.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/README.md b/README.md
index fcbc22f1..e912ac95 100644
--- a/README.md
+++ b/README.md
@@ -702,6 +702,11 @@ main = customExecParser p opts
 
 ```
 
+**Note**. If an option name is a prefix of another option, then it
+will never be matched when disambiguation is on. See
+https://github.com/pcapriotti/optparse-applicative/issues/419 for more
+details.
+
 ### Customising the help screen
 
 optparse-applicative has a number of combinators to help customise