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--- a/src/internfile/mimehandler.h
+++ b/src/internfile/mimehandler.h
@@ -109,6 +109,7 @@
     }
 
     // This only makes sense if the contents are currently txt/plain
+    // It converts from keyorigcharset to UTF-8 and sets keycharset.
     bool txtdcode(const string& who);
 
 protected: