diff --git a/Manual.md b/Manual.md
index 02c4cf58d55..8e688bf8eff 100644
--- a/Manual.md
+++ b/Manual.md
@@ -356,6 +356,8 @@ in this directory such as `${XBPS_BUILDDIR}/${wrksrc}`.
 
 - `XBPS_WRAPPERDIR` Full path to where xbps-src's wrappers for utilities are stored.
 
+- `XBPS_CROSS_BASE` Full path to where cross-compile dependencies are installed, varies according to the target architecture triplet. i.e `aarch64` -> `aarch64-unknown-linux-gnu`.
+
 <a id="available_vars"></a>
 ### Available variables