Fix doc regarding aliasing of modulus input to mbedtls_mpi_core_montmul()
Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
diff --git a/library/bignum_core.h b/library/bignum_core.h
index 1ef1b68..8e227f8 100644
--- a/library/bignum_core.h
+++ b/library/bignum_core.h
@@ -273,8 +273,8 @@
* \param[in] N Little-endian presentation of the modulus.
* This must be odd, and have exactly the same number
* of limbs as \p A.
- * It must not alias or otherwise overlap any of the
- * other parameters.
+ * It may alias \p X, but must not alias or otherwise
+ * overlap any of the other parameters.
* \param[in] AN_limbs The number of limbs in \p X, \p A and \p N.
* \param mm The Montgomery constant for \p N: -N^-1 mod 2^biL.
* This can be calculated by `mbedtls_mpi_core_montmul_init()`.