diff --git a/library/bignum_mod.c b/library/bignum_mod.c
index c2c3aec..de28093 100644
--- a/library/bignum_mod.c
+++ b/library/bignum_mod.c
@@ -1,5 +1,5 @@
 /**
- *  Internal bignum functions
+ *  Modular bignum functions
  *
  *  Copyright The Mbed TLS Contributors
  *  SPDX-License-Identifier: Apache-2.0