diff --git a/tdir.1 b/tdir.1
index 80e5e8d..0a0048f 100644
--- a/tdir.1
+++ b/tdir.1
@@ -27,7 +27,8 @@
 .TP
 .B -D
 Supress output of "dot" directories and files. i.e., Files and directories
-whose names begin with "."
+whose names begin with "."  This option is ignored when viewing
+directory tree output (-t or -Rdf).
 .TP
 .B -R
 Travel down each directory tree Recursively. Defaults to