diff --git a/src/ncsi_util.hpp b/src/ncsi_util.hpp
index eaa076d..750f0f1 100644
--- a/src/ncsi_util.hpp
+++ b/src/ncsi_util.hpp
@@ -20,10 +20,11 @@
  * @param[in] ifindex - Interface Index.
  * @param[in] package - NCSI Package.
  * @param[in] channel - Channel number with in the package.
+ * @param[in] opcode  - NCSI Send Command sub-operation
  * @param[in] payload - OEM data to send.
  * @returns 0 on success and negative value for failure.
  */
-int sendOemCommand(int ifindex, int package, int channel,
+int sendOemCommand(int ifindex, int package, int channel, int opcode,
                    std::span<const unsigned char> payload);
 
 /* @brief  This function will ask underlying NCSI driver