diff --git a/utils/TcpModule/src/TcpModule.cpp b/utils/TcpModule/src/TcpModule.cpp
index 59fd681c..8f38357f 100644
--- a/utils/TcpModule/src/TcpModule.cpp
+++ b/utils/TcpModule/src/TcpModule.cpp
@@ -21,6 +21,14 @@
 #include <cstdlib>
 #include <memory>
 #include <sys/types.h>
+/**
+ * @brief Verify that object is a legitimate (existing) server.
+ * 
+ * @param object Save the address of the character pointer variable.
+ *   If the value of the character pointer pointed by *object is "tcp_server", return turn
+ * @return true   Indicates that the server exists.
+ * @return false   Indicates that the server does not exist
+ */
 static bool TcpServerObjectCheck(void *object)
 {
     if (nullptr == object) {
@@ -33,6 +41,14 @@ static bool TcpServerObjectCheck(void *object)
     }
     return true;
 }
+/**
+ * @brief Verify that object is a legitimate (existing) client.
+ * 
+ * @param object Save the address of the character pointer variable.
+ *   If the value of the character pointer pointed by *object is "tcp_client", return turn
+ * @return true   Indicates that the client exists.
+ * @return false   Indicates that the client does not exist
+ */
 static bool TcpClientObjectCheck(void *object)
 {
     if (nullptr == object) {