diff --git a/Manual.md b/Manual.md
index c24be6e90a7..f0cb3ac3bac 100644
--- a/Manual.md
+++ b/Manual.md
@@ -395,6 +395,8 @@ in this directory such as `${XBPS_BUILDDIR}/${wrksrc}`.
 
 - `XBPS_RUST_TARGET` The target architecture triplet used by `rustc` and `cargo`.
 
+- `XBPS_BUILD_ENVIRONMENT` Enables continuous-integration-specific operations. Set to `void-packages-ci` if in continuous integration.
+
 <a id="available_vars"></a>
 ### Available variables