diff --git a/test/phpunit/testvirus.txt b/test/phpunit/testvirus.txt
index a2463df6d64..86bb55dac62 100644
--- a/test/phpunit/testvirus.txt
+++ b/test/phpunit/testvirus.txt
@@ -1 +1,2 @@
-X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*
\ No newline at end of file
+# Remove this line and replace the "AB" with "X5" at begin of line to get a file that is detected by antiviruses.
+ABO!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*