document the env and antoraVersion template variables

diff --git a/docs/modules/ROOT/pages/templates.adoc b/docs/modules/ROOT/pages/templates.adoc
index 55c96d1..450452e 100644 (file)
--- a/docs/modules/ROOT/pages/templates.adoc
+++ b/docs/modules/ROOT/pages/templates.adoc
@@ -142,6 +142,12 @@ Then, the "Edit the Page" link will not appear.
 
 | uiRootPath
 | The relative path to the root directory of the UI.
+
+| env
+| The map of environment variables (sourced from `process.env`).
+
+| antoraVersion
+| The version of Antora used to build the site (specifically the version of the @antora/page-composer package).
 |===
 
 This model is likely to grow over time.