diff --git a/router/java/src/net/i2p/router/sybil/Analysis.java b/router/java/src/net/i2p/router/sybil/Analysis.java
index ec1513fa9069671d19044187a9bd8052379bee03..9b92b428f609ae99bb1a36b030fe119f0c8a05af 100644
--- a/router/java/src/net/i2p/router/sybil/Analysis.java
+++ b/router/java/src/net/i2p/router/sybil/Analysis.java
@@ -452,7 +452,7 @@ public class Analysis extends JobImpl implements RouterApp {
                     for (RouterAddress ra : ri.getAddresses()) {
                         byte[] ip = ra.getIP();
                         if (ip != null)
-                            _context.blocklist().add(ip);
+                            _context.blocklist().add(ip, "Sybil " + h.toBase64());
                         String host = ra.getHost();
                         if (host != null)
                             blocks.add(host);