diff --git a/common/build-profiles/README b/common/build-profiles/README
index f179a0dbfff..23cb38945e4 100644
--- a/common/build-profiles/README
+++ b/common/build-profiles/README
@@ -8,3 +8,4 @@ for a specific architecture:
 	- XBPS_CFLAGS		(C compiler flags for host compiler)
 	- XBPS_CXXFLAGS		(C++ compiler flags for the host compiler)
 	- XBPS_FFLAGS		(Fortran compiler flags for the host compiler)
+	- XBPS_RUST_TARGET	(the compiler triplet for usage by cargo)