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diff --git a/doc/guix.texi b/doc/guix.texi
index e1ca095daa..1385cd4532 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -509,6 +509,11 @@ the last transaction.
 When combined with options such as @code{--install}, roll back occurs
 before any other actions.
 
+When rolling back from the first generation that actually contains
+installed packages, the profile is made to point to the @dfn{empty
+profile}, also known as @dfn{profile zero}---i.e., it contains no files
+apart from its own meta-data.
+
 @item --profile=@var{profile}
 @itemx -p @var{profile}
 Use @var{profile} instead of the user's default profile.