diff --git a/src/command.rs b/src/command.rs
index bf69c05..d8d3562 100644
--- a/src/command.rs
+++ b/src/command.rs
@@ -1,7 +1,10 @@
 use crate::grist::{Priority, Shift};
 use chrono::{DateTime, FixedOffset, TimeZone, Utc};
 use clap::{CommandFactory, Parser, Subcommand};
-use matrix_sdk::{Client, Room};
+use matrix_sdk::{
+    Client, Room,
+    ruma::events::{OriginalSyncMessageLikeEvent, room::message::RoomMessageEventContent},
+};
 
 prelude! {}
 
@@ -55,7 +58,6 @@ enum Action {
     },
 
     // should we add an option to (un)subscribe someone else?
-
     /// Se désinscrire d'un shift
     #[command(name = "désinscrire")]
     Unsubscribe {
@@ -107,9 +109,39 @@ pub fn format_shifts(shifts: Vec<Shift>) -> String {
     output
 }
 
-pub async fn handle(command: impl AsRef<str>, sender: OwnedUserId, room: Room, client: Client) -> Res<()> {
+/// Attaches a reaction to the message corresponding to `event`.
+///
+/// If sending the reaction fails, a warning is issued but not error is thrown.
+pub async fn send_reaction(
+    room: Room,
+    event: impl AsRef<EventId>,
+    reaction: impl Into<String>,
+) -> Res<()> {
+    use matrix_sdk::ruma::events::{reaction::ReactionEventContent, relation::Annotation};
+    let event = event.as_ref();
+    let reaction = reaction.into();
+    let reaction_res = room
+        .send(ReactionEventContent::new(Annotation::new(
+            event.into(),
+            reaction,
+        )))
+        .await;
+    if let Err(e) = reaction_res {
+        warn!("failed to send reaction, moving on...\n{}", e)
+    }
+    Ok(())
+}
+
+pub async fn handle(
+    command: impl AsRef<str>,
+    event: OriginalSyncMessageLikeEvent<RoomMessageEventContent>,
+    room: Room,
+    client: Client,
+) -> Res<()> {
     debug!("handling command: {}", command.as_ref());
 
+    let sender = event.sender;
+
     let args = shlex::split(command.as_ref()).ok_or_else(lazyhow!("error: Invalid quoting"))?;
 
     let mut command = Clap::command();
@@ -153,13 +185,13 @@ pub async fn handle(command: impl AsRef<str>, sender: OwnedUserId, room: Room, c
                     debug!("user asked for subscribe");
                     let _ = crate::grist::subscribe(id, sender.to_string()).await?;
                     debug!("subscribe ok");
-                    // confirm with tick reaction
+                    send_reaction(room, event.event_id, "✔️").await?;
                 }
                 Action::Unsubscribe { id } => {
                     debug!("user asked for unsubscribe");
                     let _ = crate::grist::unsubscribe(id, sender.to_string()).await?;
                     debug!("unsubscribe ok");
-                    // confirm with tick reaction
+                    send_reaction(room, event.event_id, "✔️").await?;
                 }
             }
         }
diff --git a/src/serve/message.rs b/src/serve/message.rs
index c80af65..d98ac98 100644
--- a/src/serve/message.rs
+++ b/src/serve/message.rs
@@ -84,7 +84,7 @@ pub async fn on_room_message(
         event.sender, text_content.body, body
     );
 
-    command::handle(body, event.sender, room, client).await?;
+    command::handle(body, event.clone(), room, client).await?;
     debug!("message successfully sent");
 
     Ok(())