diff --git a/README.asciidoc b/README.asciidoc
index 6e4c38183..f36d2bae9 100644
--- a/README.asciidoc
+++ b/README.asciidoc
@@ -431,7 +431,12 @@ the approach using ligatures.
 
 === How do I build kitty.app on macOS?
 
-Run:
+At first, install `optipng` command via:
+```
+brew install optipng
+```
+
+And run:
 ```
 logo/make.py
 ./setup.py kitty.app