client.go | 2 ++
 doc.go    | 9 +++++++++

diff --git a/client.go b/client.go
index 3e63cf9bb9d5732b3c64bb42a132a85cbe70d8f2..d2c2b4510c1e6617d0a55e99fbea274c79af028c 100644
--- a/client.go
+++ b/client.go
@@ -336,6 +336,8 @@ 	}
 	return cl.config.ConfigDir
 }
 
+// The directory where the Client expects to find and store configuration
+// data. Defaults to $HOME/.config/torrent.
 func (cl *Client) ConfigDir() string {
 	return cl.configDir()
 }
diff --git a/doc.go b/doc.go
index e7cc110687931505166bccbc55516ce251034fa2..a15349e57c9527c52ac29aa1c5af409b1448284b 100644
--- a/doc.go
+++ b/doc.go
@@ -14,5 +14,14 @@  * IP Blocklists
  * Some IPv6
  * UDP Trackers
 
+ConfigDir
+
+A Client has a configurable ConfigDir that defaults to $HOME/.config/torrent.
+Torrent metainfo files are cached at $CONFIGDIR/torrents/$infohash.torrent.
+Infohashes in $CONFIGDIR/banned_infohashes cannot be added to the Client. A
+P2P Plaintext Format blocklist is loaded from a file at the location specified
+by the environment variable TORRENT_BLOCKLIST_FILE if set, otherwise from
+$CONFIGDIR/blocklist.
+
 */
 package torrent