diff --git a/archivemail b/archivemail
index 6124d2a..733d46c 100755
--- a/archivemail
+++ b/archivemail
@@ -671,7 +671,7 @@ Options are as follows:
   -d, --days=NUM        archive messages older than NUM days (default: %d)
   -D, --date=DATE       archive messages older than DATE
   -m, --mindays=NUM     archive messages newer than NUM days (default: %d)
-  -N, --mindate=DATE    archive messages newer than DATE
+  -M, --mindate=DATE    archive messages newer than DATE
   -o, --output-dir=DIR  directory to store archives (default: same as original)
   -P, --pwfile=FILE     file to read imap password from (default: None)
   -F, --filter-append=STRING  append arbitrary string to the IMAP filter string