diff --git a/java/src/com/tightvnc/vncviewer/RfbInputStream.java b/java/src/com/tightvnc/vncviewer/RfbInputStream.java
index 0deea99..1588a90 100644
--- a/java/src/com/tightvnc/vncviewer/RfbInputStream.java
+++ b/java/src/com/tightvnc/vncviewer/RfbInputStream.java
@@ -2,11 +2,21 @@
 
 import java.io.IOException;
 
+//
+// This class is layer between data of private RfbProto class
+// and classes in other packages.
+//
+// For now this class is used by com.tightvnc.decoder.RawDecoder
+//
 public class RfbInputStream {
   RfbInputStream(RfbProto rfbProto) {
     rfb = rfbProto;
   }
 
+  //
+  // Read data methods
+  //
+
   public void readFully(byte b[]) throws IOException {
     readFully(b, 0, b.length);
   }