diff --git a/cmdline/README.md b/cmdline/README.md
index d8fc4401..c6c103ad 100644
--- a/cmdline/README.md
+++ b/cmdline/README.md
@@ -1,2 +1,8 @@
-This directory contains a little CLI test program; these files are not needed
-when using Delta Chat core as a library. 
+This directory contains the sources for a little CLI test program.
+
+These files are not needed when using Delta Chat Core as a library.
+
+The CLI program is compiled to `\<builddir\>/cmdline/delta`.
+
+Upon start, a test routine is executed (`stress_functions` from `stress.c`).
+To speed up the start `stress_functions(mailbox);` can be commented out in `main.c` before compilation.