diff --git a/dsdl/uavcan/equipment/gnss/745.RTCMStream.uavcan b/dsdl/uavcan/equipment/gnss/745.RTCMStream.uavcan
index c934cb775d..f69d36be1f 100644
--- a/dsdl/uavcan/equipment/gnss/745.RTCMStream.uavcan
+++ b/dsdl/uavcan/equipment/gnss/745.RTCMStream.uavcan
@@ -1,5 +1,6 @@
 #
 # GNSS RTCM SC-104 protocol raw stream container.
+# RTCM messages that are longer than max data size can be split over multiple consecutive messages.
 #
 
-uint8[<=250] data
+uint8[<=400] data