diff --git a/common/cross-profiles/README b/common/cross-profiles/README
index 9069084a80..2a2a1d4b42 100644
--- a/common/cross-profiles/README
+++ b/common/cross-profiles/README
@@ -11,5 +11,7 @@ A cross profile file must provide the following variables:
 	- XBPS_CROSS_FFLAGS	(Fortran compiler flags for the cross compiler)
 	- XBPS_CROSS_CPPFLAGS	(Preprocessor flags for the cross compiler)
 	- XBPS_CROSS_LDFLAGS	(Linker flags for the cross compiler)
+	- XBPS_CROSS_RUST_TARGET (the rust triplet for the rust cross compiler)
+	- XBPS_CROSS_RUSTFLAGS (rust compiler flags for the cross compiler)
 
 A source package matching `cross-${XBPS_CROSS_TRIPLET}' must also exist.