diff --git a/dsdl/uavcan/equipment/256.PerformAutomaticSelfTest.uavcan b/dsdl/uavcan/equipment/256.PerformAutomaticSelfTest.uavcan
index 8b358f8660..926105e624 100644
--- a/dsdl/uavcan/equipment/256.PerformAutomaticSelfTest.uavcan
+++ b/dsdl/uavcan/equipment/256.PerformAutomaticSelfTest.uavcan
@@ -1,8 +1,7 @@
 #
 # Fast automatic self test request.
-# E.g. Before flight, the flight computer should call this service on every node that provides it.
-# Such nodes should be detected with the service std.protocol.GetDataTypeInfo.
-# If at least one node fails, the start should be aborted.
+# Use the service uavcan.protocol.GetDataTypeInfo to detect whether this service is supported.
+# If at least one node fails, the mission should be aborted.
 #
 
 ---
@@ -10,4 +9,7 @@
 # Amount of extra time the node needs to finish the procedure.
 uint16 delay_msec
 
+# Status:
+#  true  - the requested procedure is being executed or was executed
+#  false - the requested procedure can't be executed right now
 bool ok
diff --git a/dsdl/uavcan/equipment/257.PerformAutomaticCalibration.uavcan b/dsdl/uavcan/equipment/257.PerformAutomaticCalibration.uavcan
index e47b5e56fc..2342cdc5b3 100644
--- a/dsdl/uavcan/equipment/257.PerformAutomaticCalibration.uavcan
+++ b/dsdl/uavcan/equipment/257.PerformAutomaticCalibration.uavcan
@@ -1,8 +1,7 @@
 #
 # Fast automatic calibration request.
-# E.g. Before flight, the flight computer should call this service on every node that provides it.
-# Such nodes should be detected with the service std.protocol.GetDataTypeInfo.
-# If at least one node fails, the start should be aborted.
+# Use the service uavcan.protocol.GetDataTypeInfo to detect whether this service is supported.
+# If at least one node fails, the mission should be aborted.
 #
 
 ---
@@ -10,4 +9,7 @@
 # Amount of extra time the node needs to finish the procedure.
 uint16 delay_msec
 
+# Status:
+#  true  - the requested procedure is being executed or was executed
+#  false - the requested procedure can't be executed right now
 bool ok