diff --git a/exercises/UNIX_HPC_exercise_instructions.md b/exercises/UNIX_HPC_exercise_instructions.md
index 740136de3aa9c1d8b816df59588d1287befe02f7..1f59c2b25e32663105fca7dd1233910436b935c2 100644
--- a/exercises/UNIX_HPC_exercise_instructions.md
+++ b/exercises/UNIX_HPC_exercise_instructions.md
@@ -269,7 +269,7 @@
 
 5. Extracting parts of a character string:
    ```sh
-   grep "variant" all_ompA.fasta | cut -d '-' -f 3       # or use the headers file
+   grep "variant" all_ompA.fasta | cut -d '_' -f 3       # or use the headers file
    ```
 6. Concatenating input and files
    ```sh