diff --git a/README.md b/README.md
index 93832b9f..daa56216 100644
--- a/README.md
+++ b/README.md
@@ -207,7 +207,7 @@ using the matched rule and runs it. Rules enabled by default are as follows:
 
 Enabled by default only on specific platforms:
 
-* `apt_get` – installs app from apt if it not installed;
+* `apt_get` – installs app from apt if it not installed (requires `python-commandnotfound` / `python3-commandnotfound`);
 * `apt_get_search` – changes trying to search using `apt-get` with searching using `apt-cache`
 * `brew_install` – fixes formula name for `brew install`;
 * `brew_unknown_command` – fixes wrong brew commands, for example `brew docto/brew doctor`;