diff --git a/sdrbase/resources/webapi/doc/html2/index.html b/sdrbase/resources/webapi/doc/html2/index.html
index eced93a84..117a26235 100644
--- a/sdrbase/resources/webapi/doc/html2/index.html
+++ b/sdrbase/resources/webapi/doc/html2/index.html
@@ -4051,6 +4051,10 @@ margin-bottom: 20px;
       "format" : "float",
       "description" : "power received in channel (dB)"
     },
+    "trackingDeltaFrequency" : {
+      "type" : "integer",
+      "description" : "difference between channel and PLL or FLL center frequency (Hz)"
+    },
     "squelch" : {
       "type" : "integer",
       "description" : "squelch status (1 if open else 0)"
@@ -37487,7 +37491,7 @@ except ApiException as e:
           </div>
           <div id="generator">
             <div class="content">
-              Generated 2020-06-21T22:52:40.950+02:00
+              Generated 2020-06-27T05:12:41.181+02:00
             </div>
           </div>
       </div>
diff --git a/sdrbase/resources/webapi/doc/swagger/include/FreqTracker.yaml b/sdrbase/resources/webapi/doc/swagger/include/FreqTracker.yaml
index 0462108eb..68a029cd5 100644
--- a/sdrbase/resources/webapi/doc/swagger/include/FreqTracker.yaml
+++ b/sdrbase/resources/webapi/doc/swagger/include/FreqTracker.yaml
@@ -63,6 +63,9 @@ FreqTrackerReport:
       description: power received in channel (dB)
       type: number
       format: float
+    trackingDeltaFrequency:
+      description: difference between channel and PLL or FLL center frequency (Hz)
+      type: integer
     squelch:
       description: squelch status (1 if open else 0)
       type: integer
diff --git a/swagger/sdrangel/code/html2/index.html b/swagger/sdrangel/code/html2/index.html
index eced93a84..117a26235 100644
--- a/swagger/sdrangel/code/html2/index.html
+++ b/swagger/sdrangel/code/html2/index.html
@@ -4051,6 +4051,10 @@ margin-bottom: 20px;
       "format" : "float",
       "description" : "power received in channel (dB)"
     },
+    "trackingDeltaFrequency" : {
+      "type" : "integer",
+      "description" : "difference between channel and PLL or FLL center frequency (Hz)"
+    },
     "squelch" : {
       "type" : "integer",
       "description" : "squelch status (1 if open else 0)"
@@ -37487,7 +37491,7 @@ except ApiException as e:
           </div>
           <div id="generator">
             <div class="content">
-              Generated 2020-06-21T22:52:40.950+02:00
+              Generated 2020-06-27T05:12:41.181+02:00
             </div>
           </div>
       </div>
diff --git a/swagger/sdrangel/code/qt5/client/SWGFreqTrackerReport.cpp b/swagger/sdrangel/code/qt5/client/SWGFreqTrackerReport.cpp
index 0fa906a41..964f1b386 100644
--- a/swagger/sdrangel/code/qt5/client/SWGFreqTrackerReport.cpp
+++ b/swagger/sdrangel/code/qt5/client/SWGFreqTrackerReport.cpp
@@ -30,6 +30,8 @@ SWGFreqTrackerReport::SWGFreqTrackerReport(QString* json) {
 SWGFreqTrackerReport::SWGFreqTrackerReport() {
     channel_power_db = 0.0f;
     m_channel_power_db_isSet = false;
+    tracking_delta_frequency = 0;
+    m_tracking_delta_frequency_isSet = false;
     squelch = 0;
     m_squelch_isSet = false;
     sample_rate = 0;
@@ -46,6 +48,8 @@ void
 SWGFreqTrackerReport::init() {
     channel_power_db = 0.0f;
     m_channel_power_db_isSet = false;
+    tracking_delta_frequency = 0;
+    m_tracking_delta_frequency_isSet = false;
     squelch = 0;
     m_squelch_isSet = false;
     sample_rate = 0;
@@ -60,6 +64,7 @@ SWGFreqTrackerReport::cleanup() {
 
 
 
+
 }
 
 SWGFreqTrackerReport*
@@ -75,6 +80,8 @@ void
 SWGFreqTrackerReport::fromJsonObject(QJsonObject &pJson) {
     ::SWGSDRangel::setValue(&channel_power_db, pJson["channelPowerDB"], "float", "");
     
+    ::SWGSDRangel::setValue(&tracking_delta_frequency, pJson["trackingDeltaFrequency"], "qint32", "");
+    
     ::SWGSDRangel::setValue(&squelch, pJson["squelch"], "qint32", "");
     
     ::SWGSDRangel::setValue(&sample_rate, pJson["sampleRate"], "qint32", "");
@@ -100,6 +107,9 @@ SWGFreqTrackerReport::asJsonObject() {
     if(m_channel_power_db_isSet){
         obj->insert("channelPowerDB", QJsonValue(channel_power_db));
     }
+    if(m_tracking_delta_frequency_isSet){
+        obj->insert("trackingDeltaFrequency", QJsonValue(tracking_delta_frequency));
+    }
     if(m_squelch_isSet){
         obj->insert("squelch", QJsonValue(squelch));
     }
@@ -123,6 +133,16 @@ SWGFreqTrackerReport::setChannelPowerDb(float channel_power_db) {
     this->m_channel_power_db_isSet = true;
 }
 
+qint32
+SWGFreqTrackerReport::getTrackingDeltaFrequency() {
+    return tracking_delta_frequency;
+}
+void
+SWGFreqTrackerReport::setTrackingDeltaFrequency(qint32 tracking_delta_frequency) {
+    this->tracking_delta_frequency = tracking_delta_frequency;
+    this->m_tracking_delta_frequency_isSet = true;
+}
+
 qint32
 SWGFreqTrackerReport::getSquelch() {
     return squelch;
@@ -161,6 +181,9 @@ SWGFreqTrackerReport::isSet(){
         if(m_channel_power_db_isSet){
             isObjectUpdated = true; break;
         }
+        if(m_tracking_delta_frequency_isSet){
+            isObjectUpdated = true; break;
+        }
         if(m_squelch_isSet){
             isObjectUpdated = true; break;
         }
diff --git a/swagger/sdrangel/code/qt5/client/SWGFreqTrackerReport.h b/swagger/sdrangel/code/qt5/client/SWGFreqTrackerReport.h
index f29c4dfc7..349ae3608 100644
--- a/swagger/sdrangel/code/qt5/client/SWGFreqTrackerReport.h
+++ b/swagger/sdrangel/code/qt5/client/SWGFreqTrackerReport.h
@@ -44,6 +44,9 @@ public:
     float getChannelPowerDb();
     void setChannelPowerDb(float channel_power_db);
 
+    qint32 getTrackingDeltaFrequency();
+    void setTrackingDeltaFrequency(qint32 tracking_delta_frequency);
+
     qint32 getSquelch();
     void setSquelch(qint32 squelch);
 
@@ -60,6 +63,9 @@ private:
     float channel_power_db;
     bool m_channel_power_db_isSet;
 
+    qint32 tracking_delta_frequency;
+    bool m_tracking_delta_frequency_isSet;
+
     qint32 squelch;
     bool m_squelch_isSet;