diff --git a/i2p2www/pages/site/docs/protocol/i2cp.html b/i2p2www/pages/site/docs/protocol/i2cp.html
index 6452daa7..311ffe3d 100644
--- a/i2p2www/pages/site/docs/protocol/i2cp.html
+++ b/i2p2www/pages/site/docs/protocol/i2cp.html
@@ -925,7 +925,7 @@ turns the gzip effort setting to 0, which may save a little CPU.
 
 <tr>
 <td>8
-<td>{% trans %}Gzip xflags{% endtrans %}</td>
+<td>{% trans %}Gzip xflags{% endtrans %} (set to 2 to be indistinguishable from the Java implementation)</td>
 </tr>
 
 <tr>
diff --git a/i2p2www/spec/i2np.rst b/i2p2www/spec/i2np.rst
index 762c08e4..7a7a4213 100644
--- a/i2p2www/spec/i2np.rst
+++ b/i2p2www/spec/i2np.rst
@@ -716,7 +716,8 @@ Notes
 
 * To hide the router OS and implementation, match the Java router implementation
   of gzip by setting the modification time to 0 and the OS byte to 0xFF,
-  and use max compression.
+  and set XFL to 0x02 (max compression, slowest algorithm).
+  See RFC 1952.
   First 10 bytes of the compressed router info will be (hex):
   1F 8B 08 00 00 00 00 00 02 FF