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diff --git a/README.md b/README.md
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@@ -6,4 +6,11 @@ These are my solutions for Advent of Code in 2024. This year I'm using Lua as t
./main <<ID>> [<<FILE>>]
```
-where `<<ID>>` is the day number followed by `a` for the first part or `b` for the second part, e.g. `01b`. If the file is not specified, it default to the number of the day with two digits and extension `.in`, i.e. `01.in`. One can use the name of a file that doesn't exist, e.g. `-`, to read from standard input.
+where `<<ID>>` is the day number followed by `a` for the first part or `b` for the second part. If the file is not specified, it defaults to the number of the day with two digits and extension `.in`, i.e. `01.in`. One can use the name of a file that doesn't exist, e.g. `-`, to read from standard input.
+
+Example:
+
+```sh
+./main 01b input
+```
+