* The special construct '@\{-<n>\}' means the <n>th branch checked out
before the current one.
-* The suffix '@{upstream}' to a ref (short form 'ref@{u}') refers to
+* The suffix '@\{upstream\}' to a ref (short form 'ref@\{u\}') refers to
the branch the ref is set to build on top of. Missing ref defaults
to the current branch.