diff --git a/core/java/src/net/i2p/util/DecayingBloomFilter.java b/core/java/src/net/i2p/util/DecayingBloomFilter.java
index f54b08f44..7f006a8b9 100644
--- a/core/java/src/net/i2p/util/DecayingBloomFilter.java
+++ b/core/java/src/net/i2p/util/DecayingBloomFilter.java
@@ -17,6 +17,8 @@ import org.xlattice.crypto.filters.BloomSHA1;
  * this may be refactored to allow tighter control of the size necessary for the
  * contained bloom filters.
  *
+ * Deprecated for use outside of the router; to be moved to router.jar.
+ *
  * See main() for an analysis of false positive rate.
  * See BloomFilterIVValidator for instantiation parameters.
  * See DecayingHashSet for a smaller and simpler version.
diff --git a/core/java/src/net/i2p/util/DecayingHashSet.java b/core/java/src/net/i2p/util/DecayingHashSet.java
index d513ce057..4c6b8c18c 100644
--- a/core/java/src/net/i2p/util/DecayingHashSet.java
+++ b/core/java/src/net/i2p/util/DecayingHashSet.java
@@ -55,6 +55,8 @@ import net.i2p.data.DataHelper;
  *
  * This performs about twice as fast as DBF in the test below.
  *
+ * Deprecated for use outside of the router; to be moved to router.jar.
+ *
  * @author zzz
  */
 public class DecayingHashSet extends DecayingBloomFilter {
diff --git a/core/java/src/org/xlattice/crypto/filters/BloomSHA1.java b/core/java/src/org/xlattice/crypto/filters/BloomSHA1.java
index f9d2986b5..d0ccc22e4 100644
--- a/core/java/src/org/xlattice/crypto/filters/BloomSHA1.java
+++ b/core/java/src/org/xlattice/crypto/filters/BloomSHA1.java
@@ -37,6 +37,7 @@ import java.util.concurrent.LinkedBlockingQueue;
  * 
  * Note that this is used only by DecayingBloomFilter, which uses only
  * the unsynchronized locked_foo() methods.
+ * Deprecated for use outside of the router; to be moved to router.jar.
  * 
  * As of 0.8.11, the locked_foo() methods are thread-safe, in that they work,
  * but there is a minor risk of false-negatives if two threads are