diff --git a/src/modules/RF69/RF69.h b/src/modules/RF69/RF69.h
index ecee7546..a5691b93 100644
--- a/src/modules/RF69/RF69.h
+++ b/src/modules/RF69/RF69.h
@@ -650,6 +650,8 @@ class RF69: public PhysicalLayer {
 
     /*!
       \brief Set FIFO threshold level.
+      Be aware that threshold is also set in setFifoFullAction method.
+      setFifoThreshold method must be called AFTER calling setFifoFullAction!
       \param Threshold level.
     */
     void setFifoThreshold(uint8_t threshold);
diff --git a/src/modules/SX127x/SX127x.h b/src/modules/SX127x/SX127x.h
index e5d5db54..af00e575 100644
--- a/src/modules/SX127x/SX127x.h
+++ b/src/modules/SX127x/SX127x.h
@@ -763,6 +763,8 @@ class SX127x: public PhysicalLayer {
 
     /*!
       \brief Set FIFO threshold level.
+      Be aware that threshold is also set in setFifoFullAction method.
+      setFifoThreshold method must be called AFTER calling setFifoFullAction!
       \param Threshold level.
     */
     void setFifoThreshold(uint8_t threshold);