diff --git a/doc/16-upgrading-icinga-2.md b/doc/16-upgrading-icinga-2.md
index b44fbf51f..cce8cd916 100644
--- a/doc/16-upgrading-icinga-2.md
+++ b/doc/16-upgrading-icinga-2.md
@@ -37,6 +37,12 @@ has been removed and this setting has no effect.
 >
 > This is important if you rely on the sysconfig configuration in your own scripts.
 
+### New Constants <a id="upgrading-to-2-10-path-new-constants"></a>
+
+New [Icinga constants](17-language-reference.md#icinga-constants) have been added in this release.
+
+* `ApiBindHost` and `ApiBindPort` to allow overriding the default ApiListener values. This will be used for an Icinga addon only.
+
 ## Upgrading to v2.9 <a id="upgrading-to-2-9"></a>
 
 ### Deprecation and Removal Notes <a id="upgrading-to-2-9-deprecation-removal-notes"></a>
diff --git a/doc/17-language-reference.md b/doc/17-language-reference.md
index 1f50f610c..de94ba4e8 100644
--- a/doc/17-language-reference.md
+++ b/doc/17-language-reference.md
@@ -409,8 +409,10 @@ Vars                |**Read-write.** Contains a dictionary with global custom at
 NodeName            |**Read-write.** Contains the cluster node name. Set to the local hostname by default.
 RunAsUser           |**Read-write.** Defines the user the Icinga 2 daemon is running as. Set in the Icinga 2 sysconfig.
 RunAsGroup          |**Read-write.** Defines the group the Icinga 2 daemon is running as. Set in the Icinga 2 sysconfig.
-MaxConcurrentChecks |**Read-write**. The number of max checks run simultaneously. Defaults to `512`.
-Environment         |**Read-write**. The name of the Icinga environment. Included in the SNI host name when making outbound connections. Defaults to `production`.
+MaxConcurrentChecks |**Read-write.** The number of max checks run simultaneously. Defaults to `512`.
+Environment         |**Read-write.** The name of the Icinga environment. Included in the SNI host name when making outbound connections. Defaults to `production`.
+ApiBindHost         |**Read-write.** Overrides the default value for the ApiListener `bind_host` attribute. Not set by default.
+ApiBindPort         |**Read-write.** Overrides the default value for the ApiListener `bind_port` attribute. Not set by default.
 
 Application runtime details: