diff --git a/Manual.md b/Manual.md
index edd87984c1..2b70cb6390 100644
--- a/Manual.md
+++ b/Manual.md
@@ -365,6 +365,10 @@ in this directory such as `${XBPS_BUILDDIR}/${wrksrc}`.
 
 - `XBPS_MACHINE` The machine architecture as returned by `xbps-uhelper arch`.
 
+- `XBPS_ENDIAN` The machine's endianness ("le" or "be").
+
+- `XBPS_LIBC` The machine's C library ("glibc" or "musl").
+
 - `XBPS_WORDSIZE` The machine's word size in bits (32 or 64).
 
 - `XBPS_SRCDISTDIR` Full path to where the `source distfiles` are stored, i.e `$XBPS_HOSTDIR/sources`.
@@ -373,6 +377,10 @@ in this directory such as `${XBPS_BUILDDIR}/${wrksrc}`.
 
 - `XBPS_TARGET_MACHINE` The target machine architecture when cross compiling a package.
 
+- `XBPS_TARGET_EDNIAN` The target machine's endianness ("le" or "be").
+
+- `XBPS_TARGET_LIBC` The target machine's C library ("glibc" or "musl").
+
 - `XBPS_TARGET_WORDSIZE` The target machine's word size in bits (32 or 64).
 
 - `XBPS_FETCH_CMD` The utility to fetch files from `ftp`, `http` of `https` servers.