psa_util: improve documentation for convert_raw_to_der_single_int()
Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/library/psa_util.c b/library/psa_util.c
index 4e350c0..1bb02e9 100644
--- a/library/psa_util.c
+++ b/library/psa_util.c
@@ -346,7 +346,7 @@
*
* \param raw_buf Buffer containing the raw coordinate to be
* converted.
- * \param raw_len Length of raw_buf in bytes.
+ * \param raw_len Length of raw_buf in bytes. This must be > 0.
* \param der_buf_start Pointer to the beginning of the buffer which
* will be filled with the DER converted data.
* \param der_buf_end End of the buffer used to store the DER output.