diff --git a/src/at/did_document.gleam b/src/at/did_document.gleam
index 43cf81b..57cb39b 100644
--- a/src/at/did_document.gleam
+++ b/src/at/did_document.gleam
@@ -4,6 +4,7 @@ import at/did.{type Did}
 import at/handle.{type Handle}
 import at/internal/encoding
 import gleam/dynamic/decode.{type Decoder}
+import gleam/function
 import gleam/json.{type Json}
 import gleam/list
 import gleam/option.{type Option, None, Some}
@@ -115,31 +116,45 @@ pub fn decoder() -> Decoder(DidDocument) {
   use controller <- decode.optional_field("controller", [], {
     decode.list(did.decoder())
   })
+
   use also_known_as <- decode.optional_field("alsoKnownAs", [], {
-    decode.list(decode.one_of(handle.at_decoder(), [handle.decoder()]))
+    decode.list(
+      decode.one_of(decode.map(handle.at_decoder(), Ok), [
+        decode.map(handle.decoder(), Ok),
+        decode.success(Error(Nil)),
+      ]),
+    )
+    |> decode.map(list.filter_map(_, function.identity))
   })
+
   use verification_method <- decode.optional_field("verificationMethod", [], {
     decode.list(embedded_verification_method_decoder())
   })
+
   use authentication <- decode.optional_field("authentication", [], {
     decode.list(verification_method_decoder())
   })
+
   use assertion_method <- decode.optional_field("assertionMethod", [], {
     decode.list(verification_method_decoder())
   })
+
   use key_agreement <- decode.optional_field("keyAgreement", [], {
     decode.list(verification_method_decoder())
   })
+
   use capability_invocation <- decode.optional_field(
     "capabilityInvocation",
     [],
-    { decode.list(verification_method_decoder()) },
+    decode.list(verification_method_decoder()),
   )
+
   use capability_delegation <- decode.optional_field(
     "capabilityDelegation",
     [],
-    { decode.list(verification_method_decoder()) },
+    decode.list(verification_method_decoder()),
   )
+
   use service <- decode.optional_field("service", [], {
     decode.list(service_endpoint_decoder())
   })
@@ -203,6 +218,12 @@ fn service_endpoint_decoder() -> Decoder(ServiceEndpoint) {
 
 // QUERIES ---------------------------------------------------------------------
 
+///
+/// 
+pub fn also_known_as(document: DidDocument) -> Result(Handle, Nil) {
+  list.first(document.also_known_as)
+}
+
 /// Find the [personal data server](https://atproto.com/guides/glossary#pds-personal-data-server)
 /// that hosts an account's repository. Once you know the location of the PDS
 /// you can start to interact with the account by, for example, fetching specific