diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index f272f5c..e1528b7 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -6,6 +6,8 @@ Posts that were liked or boosted can now be unliked and unboosted.
 
 Added a header to avoid over-zealous caching in some browsers (contributed by louis77).
 
+Added support for running and federating inside hidden networks like Tor, I2P or Loki (contributed by iwojima).
+
 ## 2.51
 
 Support for custom Emojis has been added; they are no longer hardcoded, but read from the `emojis.json` file at the server base directory. Also, they are no longer limited to string substitutions, but images as external URLs are also supported (see `snac(8)` for more information).