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-rw-r--r--doc/guix.texi8
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diff --git a/doc/guix.texi b/doc/guix.texi
index 6b6f8dedae..faad3ad6bb 100644
--- a/doc/guix.texi
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@@ -4210,6 +4210,14 @@ paths}. Derivations paths can be passed to the @code{build-derivations}
procedure to perform the build actions they prescribe (@pxref{The
Store}).
+@cindex fixed-output derivations
+Operations such as file downloads and version-control checkouts for
+which the expected content hash is known in advance are modeled as
+@dfn{fixed-output derivations}. Unlike regular derivations, the outputs
+of a fixed-output derivation are independent of its inputs---e.g., a
+source code download produces the same result regardless of the download
+method and tools being used.
+
The @code{(guix derivations)} module provides a representation of
derivations as Scheme objects, along with procedures to create and
otherwise manipulate derivations. The lowest-level primitive to create