Add note about disambiguation quirk (#419)

pcapriotti · Apr 17, 2021 · 7a686cb · 7a686cb
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diff --git 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