diff --git a/docs/reference/connection/ssh.md b/docs/reference/connection/ssh.md
index c8ca5cc..3253e2d 100644
--- a/docs/reference/connection/ssh.md
+++ b/docs/reference/connection/ssh.md
@@ -42,6 +42,9 @@ maxConnections: 255
 banner: "Yeah!"
 ```
 
+<<property("preparationMessages", "Preparation Messages", "#preparation-messages")>>
+See [below](#preparation-messages).
+
 ## Keys
 
 ### Configuration
@@ -54,6 +57,8 @@ Default Locations:
 * Linux: `/etc/engity/bifroest/key`
 * Windows: `C:\ProgramData\Engity\Bifroest\key`
 
+The backend type is [Strings Template](../templating/index.md#strings)<[Core](../context/core.md)>.
+
 <<property("rsaRestriction", "RSA Restriction", "../data-type.md#rsa-restriction", default="at-least-4096-bits", heading=4)>>
 Restrict which RSA keys are allowed to be used.
 
@@ -81,6 +86,16 @@ ed25519Restriction: all
 rememberMeNotification: "If you return until {{.session.validUntil | format `dateTimeT`}} with the same public key {{.key | fingerprint}}), you can seamlessly login again.\n\n"
 ```
 
+## Preparation Messages
+
+### Configuration
+
+TODO!
+
+### Examples
+
+TODO!
+
 ## Compatibility
 
 | <<dist("linux")>> | <<dist("windows")>> |
diff --git a/docs/reference/environment/docker.md b/docs/reference/environment/docker.md
new file mode 100644
index 0000000..5861930
--- /dev/null
+++ b/docs/reference/environment/docker.md
@@ -0,0 +1,8 @@
+---
+description: A docker environment is executed on the host itself (same host on which Bifröst is running).
+toc_depth: 4
+---
+
+# Docker environment
+
+TODO!
diff --git a/mkdocs.yml b/mkdocs.yml
index 08acd05..d241d01 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -144,6 +144,7 @@ nav:
           - Htpasswd: reference/authorization/htpasswd.md
       - Environments:
           - reference/environment/index.md
+          - Docker: reference/environment/docker.md
           - Local: reference/environment/local.md
       - Sessions:
           - reference/session/index.md