diff --git a/Backends.md b/Backends.md
index dc1c893..8ba53ef 100644
--- a/Backends.md
+++ b/Backends.md
@@ -6,7 +6,8 @@ The Docker backend integrates with a docker daemon running on your system to pro
 
 - **command** (optional, []string): The command to run inside the container.  Default is `["/bin/sh"]`.
 - **privileged** (optional, bool): If `true`, the command will run in privileged mode. Default is `false`.
-- **user** (optional, string): The user to run the command as inside the container.
+- **user** (optional, string): The user to run the command as inside the container. If this is not set, **user_map** will be used to determine the right user, or the seashell username will be used if the user doesn't exist in the map.
+- **user_map** (optional, map[string]string): A map from seashell usernames to docker usernames or UIDs.
 
 ### Permissions
 
@@ -126,9 +127,9 @@ The Proxy backend allows SSH connections to be proxied to another server.
 ### Settings
 
 - **server** (string): The target server's address.
-- **user** (optional, string): The user to connect as on the proxy server. If this is not set, **userMap** will be used to determine the right user, or the seashell username will be used if the user doesn't exist in the map.
+- **user** (optional, string): The user to connect as on the proxy server. If this is not set, **user_map** will be used to determine the right user, or the seashell username will be used if the user doesn't exist in the map.
 - **privkey** (optional, string): The path to the private key for authentication. If this is not provided, users will be asked for the target server's password when they attempt to connect.
-- **userMap** (optional, map[string]string): A map from seashell usernames to target server usernames.
+- **user_map** (optional, map[string]string): A map from seashell usernames to target server usernames.
 
 ### Permissions