diff --git a/.circleci/config.yml b/.circleci/config.yml
index e6a76e7f5ed..30e7194d6c8 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -212,10 +212,12 @@ jobs:
               docker push scalableminds/webknossos-dev:$CIRCLE_BRANCH
             fi
             docker logout
-
       - run:
           name: Report coverage
           command: .circleci/not-on-master.sh docker-compose run base yarn coverage
+      - run:
+          name: Send Slack notification (master only)
+          command: .circleci/slack-notification.sh
 
   nightly:
     docker:
diff --git a/.circleci/slack-notification.sh b/.circleci/slack-notification.sh
new file mode 100755
index 00000000000..dfd4b1ff73c
--- /dev/null
+++ b/.circleci/slack-notification.sh
@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+set -Eeuo pipefail
+
+if [ "${CIRCLE_BRANCH}" == "master" ] ; then
+    author=${CIRCLE_USERNAME}
+    author=${author/fm3/<@florian>}
+    author=${author/jstriebel/<@jonathan>}
+    author=${author/daniel-wer/<@daniel>}
+    author=${author/georgwiese/<@georg>}
+    author=${author/hotzenklotz/<@tom>}
+    author=${author/jfrohnhofen/<@johannes>}
+    author=${author/MichaelBuessemeyer/<@michael>}
+    author=${author/normanrz/<@norman>}
+    author=${author/philippotto/<@philipp>}
+    author=${author/rschwanhold/<@robert>}
+    author=${author/tmbo/<@tmbo>}
+    author=${author/valentin-pinkau/<@valentin>}
+    channel="webknossos-bots"
+    commitmsg=$(git log --format=%s -n 1)
+    pullregex="(.*)#([0-9]+)(.*)"
+    while [[ $commitmsg =~ $pullregex ]]
+    do
+        commitmsg="${BASH_REMATCH[1]}#<https://github.com/scalableminds/webknossos/issues/${BASH_REMATCH[2]}|${BASH_REMATCH[2]}>${BASH_REMATCH[3]}"
+    done
+    buildlink="<https://circleci.com/gh/scalableminds/webknossos/${CIRCLE_BUILD_NUM}|${CIRCLE_BUILD_NUM}>"
+    mesg="${author} your ${CIRCLE_BRANCH} build ${buildlink} “${commitmsg}” is almost finished."
+    user="circleci-notify"
+    token="${SLACK_NOTIFY_TOKEN:-}"
+    res=$(curl -s \
+        -X POST \
+        -d "token=${token}" \
+        -d "channel=${channel}" \
+        -d "text=${mesg}" \
+        -d "username=${user}" \
+        -d "icon_url=https://a.slack-edge.com/41b0a/img/plugins/circleci/service_48.png" \
+        https://slack.com/api/chat.postMessage
+    )
+    if [[ "$(echo ${res} | jq '.ok')" == "false" ]]; then
+        echo "[WARN] Error sending Slack notification: $(echo ${res} | jq -r '.error')."
+    fi
+    echo "[INFO] Sent Slack notification to ${channel}."
+fi