diff --git a/README.md b/README.md
index 8a40c1d..8867ea6 100755
--- a/README.md
+++ b/README.md
@@ -624,4 +624,4 @@ Passed as an argument to the emitted `setPumpFlow` event. The passed version is
 * `pumpId` - id of pump to get information about, first pump is 0
 * `circuitId` - index of circuit for which to change the set point (index is relative to data returned by [`SLGetPumpStatus`](#slgetpumpstatus))
 * `setPoint` - the value for which to set the pump/circuit combo
-* `isRPMs` - boolean, TRUE for RPMs, FALSE for GPMs
+* `isRPMs` - boolean, `true` for RPMs, `false` for GPMs
diff --git a/messages/SLGetPumpStatus.js b/messages/SLGetPumpStatus.js
index 315770d..a3aef3f 100644
--- a/messages/SLGetPumpStatus.js
+++ b/messages/SLGetPumpStatus.js
@@ -40,7 +40,7 @@ exports.SLGetPumpStatus = class SLGetPumpStatus extends SLMessage {
       this.pumpSetting[i] = {};
       this.pumpSetting[i].circuitId = this.readUInt32LE();
       this.pumpSetting[i].pumpSetPoint = this.readUInt32LE();
-      this.pumpSetting[i].isRPMs = this.readUInt32LE(); // 1 for RPMs; 0 for GPMs
+      this.pumpSetting[i].isRPMs = this.readUInt32LE() !== 0; // 1 for RPMs; 0 for GPMs
     }
   }