diff --git a/WIKI_EN.md b/WIKI_EN.md
index 6377afc..2cf4801 100644
--- a/WIKI_EN.md
+++ b/WIKI_EN.md
@@ -127,7 +127,7 @@ Initializes the syslog client by creating a UDP socket and configuring the desti
 
 **Parameters:**
 
-- `config` - Pointer to `zh_syslog_init_config_t` with syslog server address and port. Can point to a temporary variable.
+- `config` - Pointer to `zh_syslog_init_config_t` with syslog server address and port. Can point to a temporary variable. Must not be NULL
 
 **Returns:**
 
diff --git a/include/zh_syslog.h b/include/zh_syslog.h
index b98a7fd..1478f95 100644
--- a/include/zh_syslog.h
+++ b/include/zh_syslog.h
@@ -116,7 +116,7 @@ extern "C"
      * Creates a UDP socket and configures connection parameters
      * for the remote syslog server.
      *
-     * @param[in] config Pointer to syslog client initialization configuration structure. Can point to a temporary variable
+     * @param[in] config Pointer to syslog client initialization configuration structure. Can point to a temporary variable (must not be NULL)
      *
      * @return ESP_OK on success
      * @return ESP_ERR_INVALID_ARG if config is NULL
@@ -147,9 +147,9 @@ extern "C"
      *
      * @param[in] facility Syslog facility code (0-23)
      * @param[in] severity Syslog severity code (0-7)
-     * @param[in] hostname Pointer to device hostname that generated the message. Only alphanumeric characters without spaces
-     * @param[in] app_name Pointer to application name that generated the message. Only alphanumeric characters without spaces
-     * @param[in] message Pointer to the message payload to send
+     * @param[in] hostname Pointer to device hostname that generated the message. Only alphanumeric characters without spaces (must not be NULL)
+     * @param[in] app_name Pointer to application name that generated the message. Only alphanumeric characters without spaces (must not be NULL)
+     * @param[in] message Pointer to the message payload to send (must not be NULL)
      *
      * @return ESP_OK on success
      * @return ESP_ERR_INVALID_ARG if hostname, app_name, or message is NULL