Add return value doxygen
diff --git a/include/mbedtls/platform_util.h b/include/mbedtls/platform_util.h
index a4fcf31..95c13e1 100644
--- a/include/mbedtls/platform_util.h
+++ b/include/mbedtls/platform_util.h
@@ -212,6 +212,7 @@
* \param buf2 Second buffer to compare against.
* \param num The length of the buffers in bytes.
*
+ * \return 0 if the buffers were equal.
*/
int mbedtls_platform_memcmp( const void *buf1, const void *buf2, size_t num );
@@ -227,6 +228,7 @@
*
* \param num Max-value for the generated random number, exclusive.
* The generated number will be on range [0, num).
+ *
* \return The generated random number.
*/
uint32_t mbedtls_platform_random_in_range( size_t num );