diff --git a/docs/contribute/activity_pub.md b/docs/contribute/activity_pub.md
index 47986abe9..27017c1d6 100644
--- a/docs/contribute/activity_pub.md
+++ b/docs/contribute/activity_pub.md
@@ -10,7 +10,7 @@ To match usernames to actors, Mobilizon uses [WebFinger](https://tools.ietf.org/
 
 ## Instance subscriptions
 
-Instances subscribe to each other through an internal actor named `relay@instance.tld` that publishes (through `Announce`) every created content to it's followers. Each content creation share is saved so that updates and deletes are correctly sent to every
+Instances subscribe to each other through an internal actor named `relay@instance.tld` that publishes (through `Announce`) every created content to it's followers. Each content creation share is saved so that updates and deletes are correctly sent to every relay subscriber.
 
 ## Activities
 
@@ -46,6 +46,9 @@ See [the corresponding issue](https://framagit.org/framasoft/mobilizon/issues/32
 
 Accepted values: `allow_all`, `closed`, `moderated` (not used at the moment)
 
+!!! info
+    We also support PeerTube's `commentEnabled` property as a fallback. It is set to `true` only when `repliesModeration` is equal to `allow_all`.
+
 Example:
 ```json
 {
@@ -53,6 +56,7 @@ Example:
     "...",
     {
       "mz": "https://joinmobilizon.org/ns#",
+      "pt": "https://joinpeertube.org/ns#",
       "repliesModerationOption": {
         "@id": "mz:repliesModerationOption",
         "@type": "mz:repliesModerationOptionType"
@@ -60,11 +64,16 @@ Example:
       "repliesModerationOptionType": {
         "@id": "mz:repliesModerationOptionType",
         "@type": "rdfs:Class"
+      },
+      "commentsEnabled": {
+        "@id": "pt:commentsEnabled",
+        "@type": "sc:Boolean"
       }
     }
   ],
   "...": "...",
   "repliesModerationOption": "allow_all",
+  "commentsEnabled": true,
   "type": "Event",
   "url": "http://mobilizon1.com/events/8cf76e9f-c426-4912-9cd6-c7030b969611"
 }
diff --git a/lib/service/activity_pub/converter/event.ex b/lib/service/activity_pub/converter/event.ex
index a273b87f1..d02065fe8 100644
--- a/lib/service/activity_pub/converter/event.ex
+++ b/lib/service/activity_pub/converter/event.ex
@@ -119,6 +119,7 @@ defmodule Mobilizon.Service.ActivityPub.Converter.Event do
       "tag" => event.tags |> ConverterUtils.build_tags(),
       "maximumAttendeeCapacity" => event.options.maximum_attendee_capacity,
       "repliesModerationOption" => event.options.comment_moderation,
+      "commentsEnabled" => event.options.comment_moderation == :allow_all,
       # "draft" => event.draft,
       "ical:status" => event.status |> to_string |> String.upcase(),
       "id" => event.url,
@@ -140,7 +141,12 @@ defmodule Mobilizon.Service.ActivityPub.Converter.Event do
   defp get_options(object) do
     %{
       maximum_attendee_capacity: object["maximumAttendeeCapacity"],
-      comment_moderation: object["repliesModerationOption"]
+      comment_moderation:
+        Map.get(
+          object,
+          "repliesModerationOption",
+          if(Map.get(object, "commentsEnabled", true), do: :allow_all, else: :closed)
+        )
     }
   end
 
diff --git a/lib/service/activity_pub/utils.ex b/lib/service/activity_pub/utils.ex
index 94c06a16a..3e99e7bd6 100644
--- a/lib/service/activity_pub/utils.ex
+++ b/lib/service/activity_pub/utils.ex
@@ -32,6 +32,7 @@ defmodule Mobilizon.Service.ActivityPub.Utils do
         %{
           "sc" => "http://schema.org#",
           "ical" => "http://www.w3.org/2002/12/cal/ical#",
+          "pt" => "https://joinpeertube.org/ns#",
           "Hashtag" => "as:Hashtag",
           "category" => "sc:category",
           "uuid" => "sc:identifier",
@@ -45,6 +46,10 @@ defmodule Mobilizon.Service.ActivityPub.Utils do
             "@id" => "mz:repliesModerationOption",
             "@type" => "mz:repliesModerationOptionType"
           },
+          "commentsEnabled" => %{
+            "@type" => "sc:Boolean",
+            "@id" => "pt:commentsEnabled"
+          },
           "joinModeType" => %{
             "@id" => "mz:joinModeType",
             "@type" => "rdfs:Class"