diff --git a/drivers/entropy/Kconfig.nrf5 b/drivers/entropy/Kconfig.nrf5
index c5bddf77701..45871a08af6 100644
--- a/drivers/entropy/Kconfig.nrf5
+++ b/drivers/entropy/Kconfig.nrf5
@@ -28,29 +28,33 @@ config ENTROPY_NRF5_THR_THRESHOLD
 	int "Thread-mode low-water threshold"
 	range 4 255
 	help
-	  Low-water threshold in bytes to trigger entropy generation for
-	  thread mode consumers.
+	  Low water-mark threshold in bytes to trigger entropy generation for
+	  thread mode consumers. As soon as the number of available bytes in the
+	  buffer goes below this number hardware entropy generation will be
+	  started.
 
 config ENTROPY_NRF5_ISR_THRESHOLD
 	int "ISR low-water threshold"
 	range 12 255
 	help
-	  Low-water threshold in bytes to trigger entropy generation for
-	  ISR consumers.
+	  Low water-mark threshold in bytes to trigger entropy generation for
+	  ISR consumers. As soon as the number of available bytes in the
+	  buffer goes below this number hardware entropy generation will be
+	  started.
 
 config ENTROPY_NRF5_THR_BUF_LEN
 	int "Thread-mode buffer length"
 	range ENTROPY_NRF5_THR_THRESHOLD 255
 	help
-	  Buffer length in bytes to pre-store entropy generation for
-	  thread mode consumers.
+	  Buffer length in bytes used to store entropy bytes generated by the
+	  hardware to make them ready for thread mode consumers.
 
 config ENTROPY_NRF5_ISR_BUF_LEN
 	int "ISR buffer length"
 	range ENTROPY_NRF5_ISR_THRESHOLD 255
 	help
-	  Buffer length in bytes to pre-store entropy generation for
-	  ISR consumers.
+	  Buffer length in bytes used to store entropy bytes generated by the
+	  hardware to make them ready for ISR consumers.
 
 config ENTROPY_NRF5_PRI
 	int "RNG interrupt priority"