diff --git a/flake.nix b/flake.nix
index 6dd6e58..2ec9ddf 100644
--- a/flake.nix
+++ b/flake.nix
@@ -33,8 +33,17 @@
           nattopages = pkgs.stdenv.mkDerivation {
             name = "nattopages";
             src = cleanSrc;
-            phases = "unpackPhase buildPhase";
+            phases = "unpackPhase patchPhase buildPhase";
             nativeBuildInputs = [ site ];
+            patchPhase =
+              let
+                cachix = "pain";
+              in
+              ''
+                substituteInPlace templates/default.html \
+                  --replace '{+nixstorepath+}' $out \
+                  --replace '{+cachix+}' ${cachix}
+              '';
             buildPhase = (pkgs.lib.concatStringsSep "\n" vars) + "\n" +
               ''
                 site build
diff --git a/templates/default.html b/templates/default.html
index 1510697..6a1b5b4 100644
--- a/templates/default.html
+++ b/templates/default.html
@@ -31,7 +31,8 @@
             Site proudly generated by
             <a href="http://jaspervdj.be/hakyll">Hakyll</a><br>
             53EC 089E F230 E47A 83BA  8F81 9594 9BD4 B853 F559<br>
-            <a href="/rss.xml">RSS 2.0</a>
+            <a href="/rss.xml">RSS 2.0</a><br>
+            These pages were built in <a href="https://{+cachix+}.cachix.org">{+nixstorepath+}</a>
             <ul class="subdomains" style="list-style-type: none;">
                 $for(subdomains)$
                     <li style="display: inline-block;">