diff --git a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/publicChannels/concord/ConcordChannelScreen.kt b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/publicChannels/concord/ConcordChannelScreen.kt
index 15b74fd062..9a1a631ef6 100644
--- a/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/publicChannels/concord/ConcordChannelScreen.kt
+++ b/amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/publicChannels/concord/ConcordChannelScreen.kt
@@ -63,11 +63,13 @@ import com.vitorpamplona.amethyst.commons.icons.symbols.MaterialSymbols
 import com.vitorpamplona.amethyst.commons.model.cache.LocalCache
 import com.vitorpamplona.amethyst.commons.model.chats.formatHistoryReachDate
 import com.vitorpamplona.amethyst.commons.model.concord.ConcordCommunitySession
+import com.vitorpamplona.amethyst.commons.model.concord.ConcordMembership
 import com.vitorpamplona.amethyst.commons.model.concordChannelLastReadRoute
 import com.vitorpamplona.amethyst.commons.nip30CustomEmojis.ui.ShowEmojiSuggestionList
 import com.vitorpamplona.amethyst.commons.relayClient.user.observeUserInfo
 import com.vitorpamplona.amethyst.commons.resources.Res
 import com.vitorpamplona.amethyst.commons.resources.back
+import com.vitorpamplona.amethyst.commons.resources.concord_banned_notice
 import com.vitorpamplona.amethyst.commons.resources.concord_dissolved_read_only
 import com.vitorpamplona.amethyst.commons.resources.concord_private_channel_cut
 import com.vitorpamplona.amethyst.commons.resources.concord_private_channel_no_key
@@ -305,6 +307,10 @@ fun ConcordChannelScreen(
                 // CORD-02 §9: an owner-signed tombstone seals the community read-only — the composer is
                 // gone (canPost() is false) and this replaces it so the seal is explained, not silent.
                 ConcordDissolvedNotice()
+            } else if (channel.membership == ConcordMembership.BANNED) {
+                // CORD-04 §4: every reader drops a banned author's messages, so the composer is gone;
+                // say why instead of leaving the bottom of the screen silently empty.
+                ConcordReadOnlyNotice(Res.string.concord_banned_notice)
             } else if (!channel.keyHeld) {
                 // CORD-03 §1: a Private Channel is keyed independently; without its key there is no
                 // plane only its members can read, so nothing may be posted (never to the root plane).
diff --git a/commonsUI/src/commonMain/composeResources/values/strings.xml b/commonsUI/src/commonMain/composeResources/values/strings.xml
index a7b7e7212d..cbdd31b138 100644
--- a/commonsUI/src/commonMain/composeResources/values/strings.xml
+++ b/commonsUI/src/commonMain/composeResources/values/strings.xml
@@ -617,6 +617,7 @@
     <string name="concord_dissolved_read_only">This community has been dissolved and is now read-only. You can still read its history, but no new messages can be posted.</string>
     <string name="concord_private_channel_no_key">This is a private channel and you don't hold its key, so you can't read it or post here.</string>
     <string name="concord_private_channel_cut">You no longer have access to this private channel: its key was rotated without you, so you can't read new messages or post here.</string>
+    <string name="concord_banned_notice">You're banned from this community, so you can't post here and your messages are hidden from everyone.</string>
     <string name="concord_pinned_title">Pinned messages</string>
     <string name="concord_pinned_empty">No pinned messages in this channel yet.</string>
     <string name="concord_pinned_unavailable">This channel's pins are sealed under a key you don't hold, so they can't be shown here, and pinning is paused until they can be read.</string>