diff --git a/README.md b/README.md
index c4c3c4c..8ed0d2a 100755
--- a/README.md
+++ b/README.md
@@ -206,6 +206,8 @@ Sets the heating setpoint for any body. See [`SLSetHeatSetPointMessage`](#slseth
 * `controllerConfig` - Indicates that a response to `getControllerConfig()` has been received. Event handler receives a [`SLControllerConfigMessage`](#slcontrollerconfigmessage) object.
 * `circuitStateChanged` - Indicates that a response to `setCircuitState()` has been received. Event handler receives a [`SLSetCircuitStateMessage`](#slsetcircuitstatemessage) object.
 * `setPointChanged` - Indicates that a response to `setSetPoint()` has been received. Event handler receives a [`SLSetHeatSetPointMessage`](#slsetheatsetpointmessage) object.
+* `loginFailed` - Indicates that a remote login attempt via supplying a system address and password to `UnitConnection` has failed likely due to the incorrect password being used.
+* `badParameter` - Indicates that a bad parameter has been supplied to a function. This can be triggered, for example, by sending the wrong controller ID to a `set` function.
 
 ### Properties
 
diff --git a/index.js b/index.js
index 512594f..4c131d7 100644
--- a/index.js
+++ b/index.js
@@ -259,6 +259,10 @@ class UnitConnection extends EventEmitter {
         // console.log("  it's a login failure.");
         this.emit('loginFailed');
         break;
+      case 31:
+        // console.log("  it's a parameter failure.");
+        this.emit('badParameter');
+        break;
       default:
         // console.log("  it's unknown. type: " + msgType);
         break;