--- a/tools/xm2jss.c	Tue Aug 22 14:04:32 2017 +0300
+++ b/tools/xm2jss.c	Tue Aug 22 14:28:40 2017 +0300
@@ -620,6 +620,7 @@
     {
         JSSExtInstrument *einst = module->extInstruments[index];
 
+        // Misc data
         BOOL ok =
             dm_fwrite_byte(outFile, einst->nsamples) &&
             dm_fwrite_byte(outFile, einst->vibratoType) &&
@@ -628,6 +629,7 @@
             dm_fwrite_le16(outFile, einst->vibratoRate) &&
             dm_fwrite_le16(outFile, einst->fadeOut);
 
+        // Sample number for note(s)
         for (int i = 0; ok && i < jsetNNotes; i++)
         {
             int snum = einst->sNumForNotes[i];
@@ -635,6 +637,7 @@
             ok = dm_fwrite_le32(outFile, tmp);
         }
 
+        // Envelopes
         if (!ok ||
             !jssMODWriteEnvelope(outFile, &einst->volumeEnv, "volume", index) ||
             !jssMODWriteEnvelope(outFile, &einst->panningEnv, "panning", index))
@@ -661,11 +664,13 @@
     if (module->instruments[index] != NULL)
     {
         JSSInstrument *inst = module->instruments[index];
+
+        // Determine conversion flags to use
         inst->convFlags = (inst->flags & jsf16bit) ? flags16 : flags8;
         if (inst->data != NULL)
             inst->convFlags |= jsampHasData;
 
-        // Write instrument header to file
+        // Write instrument header
         if (!dm_fwrite_le32(outFile, inst->size) ||
             !dm_fwrite_le32(outFile, inst->loopS) ||
             !dm_fwrite_le32(outFile, inst->loopE) ||
@@ -687,7 +692,8 @@
     else
     {
         JSSWARNING(DMERR_NULLPTR, DMERR_NULLPTR,
-        "Instrument #%d NULL!\n", index);
+        "Instrument #%d NULL!\n",
+        index);
     }
 
     dmMsg(1," * %d Instrument headers, %d bytes.\n",