diff --git a/.gitlab/issue_templates/bug.md b/.gitlab/issue_templates/bug.md
index 53a79f5828..e20f586008 100644
--- a/.gitlab/issue_templates/bug.md
+++ b/.gitlab/issue_templates/bug.md
@@ -55,6 +55,10 @@ https://www.qemu.org/contribute/security-process/
 <!--
 Attach logs, stack traces, screenshots, etc. Compress the files if necessary.
 If using libvirt, libvirt logs and XML domain information may be relevant.
+
+If attaching binary test cases you should describe where they were obtained
+from, preferably linking to the original source. We greatly prefer test cases in
+the form of source code that can be audited before compiling by the engineer.
 -->
 
 <!--