diff --git a/mailserver.env b/mailserver.env
index 0d00de0a..1ec88dd2 100644
--- a/mailserver.env
+++ b/mailserver.env
@@ -130,8 +130,9 @@ ENABLE_IMAP=1
 # **0** => Disabled
 ENABLE_CLAMAV=0
 
-# Add the value as a prefix to the mail subject when spam is detected.
-# NOTE: By default spam is delivered to a junk folder, reducing the value of a subject prefix for spam.
+# Add the value of this ENV as a prefix to the mail subject when spam is detected.
+# NOTE: This subject prefix may be redundant (by default spam is delivered to a junk folder).
+#       It provides value when your junk mail is stored alongside legitimate mail instead of a separate location (like with `SPAMASSASSIN_SPAM_TO_INBOX=1` or `MOVE_SPAM_TO_JUNK=0` or a POP3 only setup, without IMAP).
 # NOTE: When not using Docker Compose, other CRI may not support quote-wrapping the value here to preserve any trailing white-space.
 SPAM_SUBJECT=