diff --git a/README.md b/README.md
index ada9a43ec85711062f42776102143dd97029ad47..553aa7797890fd48c315854e7801a436fd59f0f0 100644
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+++ b/README.md
@@ -21,6 +21,11 @@
 - Automatic description inclusion in help message.
 - Automatic license inclusion in help message.
 
+Tested on:
+
+- GNU Linux Debian 12 with GNU Make 4.3
+- macOS Sonoma 14.4.1 with GNU Make 3.81
+
 ## How to use
 
 First you will need to download `makext.mk` file from the repository to