### v11, implemented by >= 0.9.7
-Reply to to PA_COMMAND_GET_SINK_INPUT_INFO, PA_COMMAND_GET_SINK_INPUT_INFO_LIST gets new field at the end:
+Reply to PA_COMMAND_GET_SINK_INPUT_INFO, PA_COMMAND_GET_SINK_INPUT_INFO_LIST gets new field at the end:
mute
new flag at end of CREATE_PLAYBACK_STREAM:
bool relative_volume
+
+## v18, implemented by >= 0.9.22
+
+new flag at end of CREATE_PLAYBACK_STREAM:
+
+ bool passthrough
+
+## v19, implemented by >= 0.9.22
+
+New flag at the end of sink input and source output introspection data:
+
+ bool corked
+
+## v20, implemented by >= 1.0
+
+Two new flags at the end of sink input introspection data:
+
+ bool has_volume
+ bool volume_writable
+
+## v21, implemented by >= 1.0
+
+Changes for format negotiation in the extended API.
+
+New fields PA_COMMAND_CREATE_PLAYBACK_STREAM:
+
+ uint8_t n_formats
+ format_info format1
+ ...
+ format_info formatn
+
+One new field in reply from PA_COMMAND_CREATE_PLAYBACK_STREAM:
+
+ format_info format
+
+New fields in reply from PA_COMMAND_GET_SINK_INFO (and thus
+PA_COMMAND_GET_SINK_INFO_LIST)
+
+ uint8_t n_formats
+ format_info format1
+ ...
+ format_info formatn
+
+One new field in reply from PA_COMMAND_GET_SINK_INPUT_INFO (and thus
+PA_COMMAND_GET_SINK_INPUT_INFO_LIST)
+
+ format_info format
+
+## v22, implemented by >= 1.0
+
+New fields PA_COMMAND_CREATE_RECORD_STREAM:
+
+ uint8_t n_formats
+ format_info format1
+ ...
+ format_info formatn
+ volume
+ bool muted
+ bool volume_set
+ bool muted_set
+ bool relative_volume
+ bool passthrough
+
+One new field in reply from PA_COMMAND_CREATE_RECORD_STREAM:
+
+ format_info format
+
+New fields in reply from PA_COMMAND_GET_SOURCE_INFO (and thus
+PA_COMMAND_GET_SOURCE_INFO_LIST)
+
+ uint8_t n_formats
+ format_info format1
+ ...
+ format_info formatn
+
+Five new fields in reply from PA_COMMAND_GET_SOURCE_OUTPUT_INFO (and thus
+PA_COMMAND_GET_SOURCE_OUTPUT_INFO_LIST)
+
+ volume
+ bool mute
+ bool has_volume
+ bool volume_writable
+ format_info format
+
+## v23, implemented by >= 1.0
+
+New field in PA_COMMAND_UNDERFLOW:
+
+ int64_t index
+
+## v24, implemented by >= 2.0
+
+New field in all commands that send/receive port introspection data
+(PA_COMMAND_GET_(SOURCE|SINK)_INFO,
+PA_COMMAND_GET_(SOURCE|SINK)_INFO_LIST):
+
+ uint32_t available
+
+The field is added once for every port.
+
+## v25, implemented by >= 2.0
+
+When port availability changes, send a subscription event for the
+owning card.
+
+## v26, implemented by >= 2.0
+
+In reply from PA_COMMAND_GET_CARD_INFO (and thus
+PA_COMMAND_GET_CARD_INFO_LIST), the following is added:
+
+ uint32_t n_ports
+
+...followed by n_ports extended port entries, which look like this:
+
+ string name
+ string description
+ uint32_t priority
+ uint32_t available
+ uint8_t direction
+ proplist
+ uint32_t n_profiles
+ string profile_name_1
+ ...
+ string profile_name_n
+
+Profile names must match earlier sent profile names for the same card.
+
+## v27, implemented by >= 3.0
+
+New opcodes:
+ PA_COMMAND_SET_PORT_LATENCY_OFFSET
+
+New field in the card commands that send/receive port introspection data
+PA_COMMAND_GET_CARD_INFO(_LIST)):
+
+ int64_t latency_offset
+
+The field is added once for every port.
+
+## v28, implemented by >= 4.0
+
+New value for encoding format type in format_info
+PA_COMMAND_CREATE_(PLAYBACK|RECORDING)_STREAM and its reply,
+In reply from PA_COMMAND_GET_(SOURCE|SOURCE_OUTPUT|SINK|SINK_INPUT)_INFO[_LIST],
+SUBCOMMAND_SAVE_FORMATS, in reply from SUBCOMMAND_READ_FORMATS[_ALL]
+
+ (uint8_t ) PA_ENCODING_MPEG2_AAC_IEC61937 := 6
+
+## v29, implemented by >= 5.0
+#
+New field in all commands that send/receive profile introspection data
+(PA_COMMAND_GET_CARD_INFO)
+
+ uint32 available
+
+The field is added once for every profile.
+
+#### If you just changed the protocol, read this
+## module-tunnel depends on the sink/source/sink-input/source-input protocol
+## internals, so if you changed these, you might have broken module-tunnel.
+## Don't forget to test module-tunnel-{source,sink} when pushing protocol
+## changes.