diff --git a/src/include/ipc/info.h b/src/include/ipc/info.h
index 3f628b174467..7c92f197dd25 100644
--- a/src/include/ipc/info.h
+++ b/src/include/ipc/info.h
@@ -54,7 +54,7 @@ struct sof_ipc_fw_version {
 	uint8_t time[10];
 	uint8_t tag[6];
 	uint32_t abi_version;
-	/* used to check FW and ldc file compatibility, reproducible value */
+	/** used to check FW and ldc file compatibility, reproducible value (ABI3.17) */
 	uint32_t src_hash;
 
 	/* reserved for future use */
@@ -109,7 +109,7 @@ struct sof_ipc_window_elem {
 struct sof_ipc_window {
 	struct sof_ipc_ext_data_hdr ext_hdr;
 	uint32_t num_windows;
-	struct sof_ipc_window_elem window[SOF_IPC_MAX_ELEMS];
+	struct sof_ipc_window_elem window[SOF_IPC_MAX_ELEMS]; /**< ABI3.17: Fixed size */
 } __attribute__((packed));
 
 /* extended data, compiler version */
diff --git a/src/include/ipc/topology.h b/src/include/ipc/topology.h
index b98e596b4bdd..558a2ced04fa 100644
--- a/src/include/ipc/topology.h
+++ b/src/include/ipc/topology.h
@@ -65,7 +65,7 @@ struct sof_ipc_comp {
 	uint32_t pipeline_id;
 	uint32_t core;
 
-	/* extended data length, 0 if no extended data */
+	/** extended data length, 0 if no extended data (ABI3.17) */
 	uint32_t ext_data_length;
 } __attribute__((packed));
 
diff --git a/src/include/kernel/ext_manifest.h b/src/include/kernel/ext_manifest.h
index bec0644089bc..c04db042392a 100644
--- a/src/include/kernel/ext_manifest.h
+++ b/src/include/kernel/ext_manifest.h
@@ -50,9 +50,9 @@ enum ext_man_elem_type {
 	EXT_MAN_ELEM_WINDOW		= SOF_IPC_EXT_WINDOW,
 	EXT_MAN_ELEM_CC_VERSION		= SOF_IPC_EXT_CC_INFO,
 	EXT_MAN_ELEM_PROBE_INFO		= SOF_IPC_EXT_PROBE_INFO,
-	EXT_MAN_ELEM_DBG_ABI		= SOF_IPC_EXT_USER_ABI_INFO,
-	EXT_MAN_ELEM_CONFIG_DATA	= 5,
-	EXT_MAN_ELEM_PLATFORM_CONFIG_DATA = 6,
+	EXT_MAN_ELEM_DBG_ABI		= SOF_IPC_EXT_USER_ABI_INFO, /**< ABI3.17 */
+	EXT_MAN_ELEM_CONFIG_DATA	= 5,    /**< ABI3.17 */
+	EXT_MAN_ELEM_PLATFORM_CONFIG_DATA = 6,  /**< ABI3.17 */
 };
 
 /* EXT_MAN_ELEM_CONFIG_DATA elements identificators */
@@ -100,7 +100,7 @@ struct ext_man_dbg_abi {
 	struct sof_ipc_user_abi_version dbg_abi;
 } __packed;
 
-/* EXT_MAN_ELEM_CONFIG_DATA elements */
+/** EXT_MAN_ELEM_CONFIG_DATA elements (ABI3.17) */
 struct ext_man_config_data {
 	struct ext_man_elem_header hdr;