diff --git a/dsdl/uavcan/protocol/debug/1789.KeyValue.uavcan b/dsdl/uavcan/protocol/debug/1789.KeyValue.uavcan
index 5566c0b83a..369bb1cec7 100644
--- a/dsdl/uavcan/protocol/debug/1789.KeyValue.uavcan
+++ b/dsdl/uavcan/protocol/debug/1789.KeyValue.uavcan
@@ -2,7 +2,13 @@
 # Generic named parameter (key/value pair).
 #
 
-bool alignment
-uint8[<=100] key
+#
+# Integers are exactly representable in the range (-2^24, 2^24) which is (-16'777'216, 16'777'216).
+#
+float32 value
 
-float64[<=1] value
+#
+# Tail array optimization is enabled, so if key length does not exceed 4 characters,
+# the whole message can fit into one CAN frame.
+#
+uint8[<=34] key