diff --git a/function/rbe/README.md b/function/rbe/README.md
index a749823f..e63ae7ff 100644
--- a/function/rbe/README.md
+++ b/function/rbe/README.md
@@ -5,8 +5,7 @@ A Node-RED node that
provides report-by-exception (RBE) and deadband capability.
The node blocks unless the incoming value changes - RBE mode, or
-changes by more than a certain amount (absolute value or percentage) - deadband
-mode.
+changes by more than a certain amount (absolute value or percentage) - bandgap modes.
Install
-------
@@ -19,7 +18,7 @@ Run the following command in your Node-RED user directory - typically `~/.node-r
Usage
-----
-A simple node to provide report by exception (RBE) and deadband function
+A simple node to provide report by exception (RBE) and bandgap functions
- only passes on data if it has changed.
This works on a per `msg.topic` basis. This means that a single rbe node can
@@ -31,12 +30,13 @@ The node doesn't send any output until the `msg.payload` is different to the pre
Works on numbers and strings. Useful for filtering out repeated messages of the
same value. Saves bandwidth, etc...
-### Deadband modes
+### Deadband and Narrowband modes
-In deadband mode the incoming payload should contain a parseable *number* and is
+In deadband modes the incoming payload should contain a parseable *number* and is
output only if greater than + or - the *band gap* away from the previous output.
-It can also be set to block values more than a certain distance away from the present value.
-This can be used to remove outliers or unexpected readings.
+
+The narrowband modes will block if the incoming value change is greater than + or - the band gap
+away from the previous value. Useful for ignoring outliers from a faulty sensor for example.
You can specify compare with *previous valid output value* or *previous input value*.
The former ignores any values outside the valid range, whereas the latter allows
diff --git a/function/rbe/locales/en-US/rbe.html b/function/rbe/locales/en-US/rbe.html
index 0b67ac70..44d2068d 100644
--- a/function/rbe/locales/en-US/rbe.html
+++ b/function/rbe/locales/en-US/rbe.html
@@ -1,6 +1,6 @@