diff --git a/src/modules/tls/README b/src/modules/tls/README
index 127cfa76011..94c8cfc069e 100644
--- a/src/modules/tls/README
+++ b/src/modules/tls/README
@@ -234,6 +234,14 @@ Chapter 1. Admin Guide
    module that uses libssl (OpenSSL library). A safe option is to have the
    tls module loaded first (be in the first "loadmodule" in Kamailio.cfg).
 
+   IMPORTANT: using this module compiled with newer versions of libssl
+   (e.g., v1.1+) may require Kamailio to be started with --atexit=no
+   command line parameters to avoid calling C atexit callbacks inside the
+   process ending during daemonize procedure as well as during shut down,
+   which can lead to crashes because it destroys and then accesses shared
+   memory. For example, such case has been reported for Ubuntu 20.04 or
+   RedHat 8.
+
 2. Quick Start
 
    The default kamailio.cfg file has basic tls support included, it has to