diff --git a/README.md b/README.md
index 8e00d626..41812438 100644
--- a/README.md
+++ b/README.md
@@ -89,6 +89,7 @@ make
 * [include](documentation/configuration.md#include-string)
 * [daemonize](documentation/configuration.md#daemonize-yesno)
 * [pid\_file](documentation/configuration.md#pid_file-string)
+* [unix\_socket\_dir](documentation/configuration.md#unix_socket_dir-string)
 
 ##### Logging
 
diff --git a/documentation/configuration.md b/documentation/configuration.md
index d96ef898..c0d4888c 100644
--- a/documentation/configuration.md
+++ b/documentation/configuration.md
@@ -23,6 +23,16 @@ the specified file at startup.
 
 `pid_file "/var/run/odyssey.pid"`
 
+#### unix\_socket\_dir *string*
+
+UNIX socket directory.
+
+If `unix_socket_dir` is specified, Odyssey will enable UNIX socket
+communications. Specified directory path will be used for
+searching socket files.
+
+`unix_socket_dir "/tmp"`
+
 #### log\_file *string*
 
 If log\_file is specified, Odyssey will additionally use it to write
@@ -242,6 +252,9 @@ Odyssey will fail in case it could not bind on any resolved address.
 
 #### host *string*
 
+If host is not set, Odyssey will try to listen using UNIX socket if
+`unix_socket_dir` is set.
+
 `host "*"`
 
 #### port *integer*
@@ -310,6 +323,9 @@ Set storage type to use. Supported types:
 
 Remote server address.
 
+If host is not set, Odyssey will try to connect using UNIX socket if
+`unix_socket_dir` is set.
+
 #### port *integer*
 
 Remote server port.