rebuild not working

modules/system/nix/documentation.nix

@@ -0,0 +1,28 @@
+{
+  # faster rebuilding
+  documentation = {
+    # whether to enable the `doc` output of packages
+    # generally in ${pkg}/share/ as plaintext or html
+    #  # can shave off a few megabytes
+    #  doc.enable = false;
+    #
+    #  # whether to install the `info` command and the `info`
+    #  # output of packages
+    #  info.enable = false;
+    #
+    #  man = {
+    #    # Whether to install manual pages
+    #    # this means packages that provide a `man` output will have said output
+    #    # included in the final closure
+    #    enable = true;
+    #
+    #    # Whether to generate the manual page index caches
+    #    # if true, it becomes possible to search for a page or keyword
+    #    # using utilities like apropos(1) and the -k option of man(1).
+    #    generateCaches = true;
+    #
+    #    # Whether to enable mandoc as the default man page viewer.
+    #    mandoc.enable = false; # my default manpage viewer is Neovim, so this isn't necessary
+    #  };
+  };
+}