diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index b11fd8c17e..1dc9dd137d 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -14,6 +14,13 @@ New Features
   `SslClientEngineFactory` acts as a better example of how to build custom client and server engine
   factories in order to reuse SSL contexts for performance concerns. ``PHAB_ID=D572567``
 
+Breaking API Changes
+~~~~~~~~~~~~~~~~~~~~
+
+* finagle-core: Move `DarkTrafficFilter` and `AbstractDarkTrafficFilter` from the experimental
+  finagle-exp to supported finagle-core. The package containing these classes changed from
+  `c.t.finagle.exp` to `c.t.finagle.filter`. ``PHAB_ID=D572384``
+
 20.10.0
 -------
 
diff --git a/finagle-exp/src/main/scala/com/twitter/finagle/exp/AbstractDarkTrafficFilter.scala b/finagle-core/src/main/scala/com/twitter/finagle/filter/AbstractDarkTrafficFilter.scala
similarity index 95%
rename from finagle-exp/src/main/scala/com/twitter/finagle/exp/AbstractDarkTrafficFilter.scala
rename to finagle-core/src/main/scala/com/twitter/finagle/filter/AbstractDarkTrafficFilter.scala
index dc571f81c6..f4a76555a4 100644
--- a/finagle-exp/src/main/scala/com/twitter/finagle/exp/AbstractDarkTrafficFilter.scala
+++ b/finagle-core/src/main/scala/com/twitter/finagle/filter/AbstractDarkTrafficFilter.scala
@@ -1,7 +1,7 @@
-package com.twitter.finagle.exp
+package com.twitter.finagle.filter
 
 import com.twitter.finagle.Service
-import com.twitter.finagle.exp.DarkTrafficFilter.DarkRequestAnnotation
+import com.twitter.finagle.filter.DarkTrafficFilter.DarkRequestAnnotation
 import com.twitter.finagle.stats.StatsReceiver
 import com.twitter.finagle.tracing.ForwardAnnotation
 import com.twitter.util.{Future, Promise}
diff --git a/finagle-exp/src/main/scala/com/twitter/finagle/exp/DarkTrafficFilter.scala b/finagle-core/src/main/scala/com/twitter/finagle/filter/DarkTrafficFilter.scala
similarity index 98%
rename from finagle-exp/src/main/scala/com/twitter/finagle/exp/DarkTrafficFilter.scala
rename to finagle-core/src/main/scala/com/twitter/finagle/filter/DarkTrafficFilter.scala
index 45e0f0c9b2..74246741c4 100644
--- a/finagle-exp/src/main/scala/com/twitter/finagle/exp/DarkTrafficFilter.scala
+++ b/finagle-core/src/main/scala/com/twitter/finagle/filter/DarkTrafficFilter.scala
@@ -1,4 +1,4 @@
-package com.twitter.finagle.exp
+package com.twitter.finagle.filter
 
 import com.twitter.finagle._
 import com.twitter.finagle.stats.StatsReceiver
diff --git a/finagle-exp/src/test/scala/com/twitter/finagle/exp/DarkTrafficFilterTest.scala b/finagle-core/src/test/scala/com/twitter/finagle/filter/DarkTrafficFilterTest.scala
similarity index 99%
rename from finagle-exp/src/test/scala/com/twitter/finagle/exp/DarkTrafficFilterTest.scala
rename to finagle-core/src/test/scala/com/twitter/finagle/filter/DarkTrafficFilterTest.scala
index dc9b3e43d7..ddf863d487 100644
--- a/finagle-exp/src/test/scala/com/twitter/finagle/exp/DarkTrafficFilterTest.scala
+++ b/finagle-core/src/test/scala/com/twitter/finagle/filter/DarkTrafficFilterTest.scala
@@ -1,4 +1,4 @@
-package com.twitter.finagle.exp
+package com.twitter.finagle.filter
 
 import com.twitter.conversions.DurationOps.RichDuration
 import com.twitter.finagle.client.utils.StringClient