diff --git a/site_ansto/hardsup/sct_tcpmodbus.c b/site_ansto/hardsup/sct_tcpmodbus.c
index 96ab19e5..ec3f6d65 100644
--- a/site_ansto/hardsup/sct_tcpmodbus.c
+++ b/site_ansto/hardsup/sct_tcpmodbus.c
@@ -304,6 +304,9 @@ int TCPMBReading(Ascon *a) {
   }
   if (allRead == 0 && aduLen >= (6 + RespLen)) {
     /* all of response has been read */
+    /* FIXME If the Length field (ie RespLen) is wrong then we loop forever waiting for a response.
+       Can this be detected automatically (eg timeout) and reset?
+    */
     allRead = 1;
   }
   if (allRead) {