diff --git a/USBDrive_Airplane_Data_Logger/USBDrive_Airplane_Data_Logger.ino b/USBDrive_Airplane_Data_Logger/USBDrive_Airplane_Data_Logger.ino
index d65dfbd..b23e746 100644
--- a/USBDrive_Airplane_Data_Logger/USBDrive_Airplane_Data_Logger.ino
+++ b/USBDrive_Airplane_Data_Logger/USBDrive_Airplane_Data_Logger.ino
@@ -258,8 +258,8 @@ time_t getdatetime(){
 // loop is called repeatedly
 // static vars to persist between calls
 void loop(void) { 
-  int i;
   static int t=0;
+  int i;
   char fname[16];
   
   // these buffers are used for message processing
@@ -316,6 +316,7 @@ void loop(void) {
     if (msg1>0) {
       myFile.print("G:");
       myFile.write(GPSRx,msg1);
+      // extract GPS time for RTC adjust
       msg1=0;
       i1=0;
       if (MSG_OVFL) {
@@ -357,7 +358,10 @@ void loop(void) {
       }
       t=t+1;
     }
-    
+
+    // closing myFile requires starting a new FS
+    // then opening a new FS (myFiles)
+    // then opening a new file (myFile)
     if (!myFile) { /* open a new file */
       myDrive1.begin();
       myDrive1.startFilesystems();