diff --git a/include/mbedtls/bignum.h b/include/mbedtls/bignum.h
index 0727917..c4d7686 100644
--- a/include/mbedtls/bignum.h
+++ b/include/mbedtls/bignum.h
@@ -523,6 +523,24 @@
                               size_t buflen );
 
 /**
+ * \brief          Export X into unsigned binary data, little endian.
+ *                 Always fills the whole buffer, which will end with zeros
+ *                 if the number is smaller.
+ *
+ * \param X        The source MPI. This must point to an initialized MPI.
+ * \param buf      The output buffer. This must be a writable buffer of length
+ *                 \p buflen Bytes.
+ * \param buflen   The size of the output buffer \p buf in Bytes.
+ *
+ * \return         \c 0 if successful.
+ * \return         #MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL if \p buf isn't
+ *                 large enough to hold the value of \p X.
+ * \return         Another negative error code on different kinds of failure.
+ */
+int mbedtls_mpi_write_binary_le( const mbedtls_mpi *X,
+                                 unsigned char *buf, size_t buflen );
+
+/**
  * \brief          Perform a left-shift on an MPI: X <<= count
  *
  * \param X        The MPI to shift. This must point to an initialized MPI.