diff --git a/library/bignum_mod_raw.h b/library/bignum_mod_raw.h
index bdd2ead..82a8ce8 100644
--- a/library/bignum_mod_raw.h
+++ b/library/bignum_mod_raw.h
@@ -58,7 +58,7 @@
                                       unsigned char assign );
 
 /**
- * \brief   Perform a safe conditional copy of MPI which doesn't reveal whether
+ * \brief   Perform a safe conditional swap of MPI which doesn't reveal whether
  *          the condition was true or not.
  *
  * \param[IN,OUT] X     The address of the first MPI. This must be initialized.