diff --git a/libXISF b/libXISF
index 4db1d86..263b380 160000
--- a/libXISF
+++ b/libXISF
@@ -1 +1 @@
-Subproject commit 4db1d865305405627d9db9579cb2f1dde1cad8ed
+Subproject commit 263b380dbfdb6f1cb17980ec29025616ca44e3e0
diff --git a/scriptengine.cpp b/scriptengine.cpp
index 6d61640..c2dfc84 100644
--- a/scriptengine.cpp
+++ b/scriptengine.cpp
@@ -6,6 +6,7 @@
 #include "rawimage.h"
 #include "loadrunable.h"
 #include <fitsio2.h>
+#include "libXISF/libxisf.h"
 
 namespace Script
 {
@@ -15,8 +16,8 @@ ScriptEngine::ScriptEngine(QObject *parent) : QObject(parent)
   , _database(new Database(this))
   , _pool(new QThreadPool(this))
 {
-    QJSValue engine = _jsEngine->newQObject(this);
-    _jsEngine->globalObject().setProperty("engine", engine);
+    QJSValue core = _jsEngine->newQObject(this);
+    _jsEngine->globalObject().setProperty("core", core);
     QJSValue fitsRecordObject = _jsEngine->newQMetaObject(&FITSRecordModify::staticMetaObject);
     _jsEngine->globalObject().setProperty("FITSRecordModify", fitsRecordObject);
     _database->init(QLatin1String("scriptengine"));
@@ -432,6 +433,34 @@ bool File::modifyFITSRecords(const FITSRecordModify *modify)
 
         return status == 0;
     }
+    else if(suffix() == "xisf")
+    {
+        try
+        {
+            LibXISF::XISFModify modifyXISF;
+            modifyXISF.open(_path.toLocal8Bit().data());
+            QFileInfo in(_path);
+            QFileInfo out(_path + "~");
+
+            for(auto &remove : modify->_remove)
+                modifyXISF.removeFITSKeyword(0, remove.toStdString());
+
+            for(auto &record : modify->_update)
+                modifyXISF.updateFITSKeyword(0, {record.key.toStdString(), record.value.toString().toStdString(), record.value.toString().toStdString()}, true);
+
+            for(auto &record : modify->_add)
+                modifyXISF.addFITSKeyword(0, {record.key.toStdString(), record.value.toString().toStdString(), record.value.toString().toStdString()});
+
+            modifyXISF.save(out.filesystemAbsoluteFilePath());
+            modifyXISF.close();
+            std::filesystem::rename(out.filesystemAbsoluteFilePath(), in.filesystemAbsoluteFilePath());
+        }
+        catch(LibXISF::Error &err)
+        {
+            _engine->newMessage("Failed to modify file " + _path + " " + err.what(), true);
+            return false;
+        }
+    }
 
     return false;
 }