diff --git a/slsDetectorSoftware/include/sls/Detector.h b/slsDetectorSoftware/include/sls/Detector.h
index ef4b9c251..743c80b77 100644
--- a/slsDetectorSoftware/include/sls/Detector.h
+++ b/slsDetectorSoftware/include/sls/Detector.h
@@ -995,7 +995,7 @@ class Detector {
 
     /** only at multi module level without gap pixels. If more than 1 ROI per
      * UDP port, it will throw. Setting number of udp interfaces will clear the
-     * roi */
+     * roi. Cannot be set for CTB or Xilinx CTB */
     void setRxROI(const std::vector<defs::ROI> &args);
 
     void clearRxROI();
diff --git a/slsDetectorSoftware/src/CallerSpecial.cpp b/slsDetectorSoftware/src/CallerSpecial.cpp
index f7c08a5bd..7ff78d8ef 100644
--- a/slsDetectorSoftware/src/CallerSpecial.cpp
+++ b/slsDetectorSoftware/src/CallerSpecial.cpp
@@ -745,7 +745,8 @@ std::string Caller::rx_roi(int action) {
         "get command.\n"
         "\t- Use the command 'rx_clearroi' to clear all ROIs.\n"
         "\t- Changing the number of UDP interfaces will automatically clear "
-        "the current ROIs.\n";
+        "the current ROIs.\n\n"
+        "\t- Cannot be set for CTB or Xilinx CTB.\n";
 
     if (action == defs::HELP_ACTION) {
         os << helpMessage;
diff --git a/slsDetectorSoftware/src/Detector.cpp b/slsDetectorSoftware/src/Detector.cpp
index cb7e33018..14a6d7cc0 100644
--- a/slsDetectorSoftware/src/Detector.cpp
+++ b/slsDetectorSoftware/src/Detector.cpp
@@ -1387,7 +1387,6 @@ std::vector<defs::ROI> Detector::getRxROI(int module_id) const {
     return pimpl->getRxROI(module_id);
 }
 
-// RxROIs can be set for all types except CTB. At multi level without gap pixels
 void Detector::setRxROI(const std::vector<defs::ROI> &args) {
     pimpl->setRxROI(args);
 }