diff --git a/docs/simplesamlphp-authproc.txt b/docs/simplesamlphp-authproc.txt
index 51fae63c4b88aeb38bb3764495ab70133bdc2d95..b00a3fe03dd5ae299e3c28e47ff5175167c322cf 100644
--- a/docs/simplesamlphp-authproc.txt
+++ b/docs/simplesamlphp-authproc.txt
@@ -128,6 +128,7 @@ The following filters are included in the simpleSAMLphp distribution:
 - [`authorize:Authorize`](./authorize:authorize): Access control based on regular expressions.
 - [`consent:Consent`](./consent:consent): Ask the user for consent before transmitting attributes.
 - [`core:AttributeAdd`](./core:authproc_attributeadd): Add attributes to the response.
+- [`core:AttributeCopy`](./core:authproc_attributecopy): Copy existing attributes to the response.
 - [`core:AttributeAlter`](./core:authproc_attributealter): Do search-and-replace on attributevalues.
 - [`core:AttributeLimit`](./core:authproc_attributelimit): Limit the attributes in the response.
 - [`core:AttributeMap`](./core:authproc_attributemap): Change the name of the attributes.
diff --git a/modules/core/docs/authproc_attributecopy.txt b/modules/core/docs/authproc_attributecopy.txt
new file mode 100644
index 0000000000000000000000000000000000000000..37c99eaec11990186613e799bad6af4c8587c777
--- /dev/null
+++ b/modules/core/docs/authproc_attributecopy.txt
@@ -0,0 +1,18 @@
+`core:AttributeCopy`
+===================
+
+Filter that renames attributes.
+
+
+Examples
+--------
+
+Copy a single attribute (user's uid will be copied to the user's username):
+
+    'authproc' => array(
+        50 => array(
+            'class' => 'core:AttributeCopy',
+            'uid' => 'username',
+        ),
+    ),
+