<refsect1>
<title>Return Value</title>
- <para>On success, these functions return a non-negative integer. On failure, they return a negative
- errno-style error code.</para>
+ <para>On success, these functions return a non-negative integer.
+ <function>sd_bus_message_open_container()</function> and <function>sd_bus_message_close_container()</function>
+ return 0.
+ <function>sd_bus_message_enter_container()</function> returns 1 if it successfully opened a new container, and 0 if
+ that was not possible because the end of the currently open container or message was reached.
+ <function>sd_bus_message_exit_container()</function> returns 1 on success.
+ On failure, all of these functions return a negative errno-style error code.</para>
<refsect2>
<title>Errors</title>