diff --git a/.circleci/script/publish_artifact.clj b/.circleci/script/publish_artifact.clj
index 1b5f5b74..6b0a75e9 100755
--- a/.circleci/script/publish_artifact.clj
+++ b/.circleci/script/publish_artifact.clj
@@ -1,23 +1,35 @@
-(require '[clojure.java.shell :refer [sh]]
+(require '[cheshire.core :refer [generate-string]]
          '[clojure.java.io :as io]
-         '[cheshire.core :refer [generate-string]]
+         '[clojure.java.shell :refer [sh]]
          '[clojure.string :as str])
 
 (def channel "#babashka_circleci_builds")
 #_(def channel "#_test")
 (def babashka-version (str/trim (slurp (io/file "resources" "BABASHKA_VERSION"))))
-
-(def text (format "[%s - %s@%s]: https://%s-201467090-gh.circle-artifacts.com/0/release/babashka-%s-%s-amd64.zip"
-                  (System/getenv "BABASHKA_PLATFORM")
-                  (System/getenv "CIRCLE_BRANCH")
-                  (System/getenv "CIRCLE_SHA1")
-                  (System/getenv "CIRCLE_BUILD_NUM")
-                  babashka-version
-                  (System/getenv "BABASHKA_PLATFORM")))
-
 (def slack-hook-url (System/getenv "SLACK_HOOK_URL"))
-(when slack-hook-url
-  (let [json (generate-string {:username "borkdude"
-                               :channel channel
-                               :text text})]
-    (sh "curl" "-X" "POST" "-H" "Content-Type: application/json" "-d" json slack-hook-url)))
+
+(defn slack! [text]
+  (when slack-hook-url
+    (let [json (generate-string {:username "borkdude"
+                                 :channel channel
+                                 :text text})]
+      (sh "curl" "-X" "POST" "-H" "Content-Type: application/json" "-d" json slack-hook-url))))
+
+(def release-text (format "[%s - %s@%s]: https://%s-201467090-gh.circle-artifacts.com/0/release/babashka-%s-%s-amd64.zip"
+                          (System/getenv "BABASHKA_PLATFORM")
+                          (System/getenv "CIRCLE_BRANCH")
+                          (System/getenv "CIRCLE_SHA1")
+                          (System/getenv "CIRCLE_BUILD_NUM")
+                          babashka-version
+                          (System/getenv "BABASHKA_PLATFORM")))
+
+(slack! release-text)
+
+(def binary-size-text
+  (format "[%s - %s@%s] binary size: %s"
+          (System/getenv "BABASHKA_PLATFORM")
+          (System/getenv "CIRCLE_BRANCH")
+          (System/getenv "CIRCLE_SHA1")
+          (slurp (io/file "/tmp/bb_size/size"))))
+
+(slack! binary-size-text)
diff --git a/.circleci/script/release b/.circleci/script/release
index 2d32f514..5e6325bf 100755
--- a/.circleci/script/release
+++ b/.circleci/script/release
@@ -8,6 +8,8 @@ cp bb /tmp/release
 VERSION=$(cat resources/BABASHKA_VERSION)
 
 cd /tmp/release
+mkdir -p /tmp/bb_size
+./bb '(spit "/tmp/bb_size/size" (.length (io/file "bb")))'
 
 ## release binary as zip archive