diff --git a/test_program_methods/guest/src/bin/flash_swap_callback.rs b/test_program_methods/guest/src/bin/flash_swap_callback.rs
index e0bdf3ed..2b0662eb 100644
--- a/test_program_methods/guest/src/bin/flash_swap_callback.rs
+++ b/test_program_methods/guest/src/bin/flash_swap_callback.rs
@@ -17,7 +17,7 @@
 //!   will fail (vault balance < initial), causing full atomic rollback. This simulates a malicious
 //!   or buggy callback that does not repay the flash loan.
 //!
-//! # Note on caller_program_id
+//! # Note on `caller_program_id`
 //!
 //! This program does not enforce any access control on `caller_program_id`.
 //! It is designed to be called by the flash swap initiator but could in principle be