diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 40d794863..b04a1b96a 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -33,6 +33,13 @@ jobs:
       - name: Check closure size
         run: |
           nix run .#check-closure-size
+      - name: Docs for flake.parts
+        run: |
+          # TODO: Define this in nixci itself.
+          nix build \
+            github:hercules-ci/flake.parts-website#generated-docs-emanote \
+            --override-input emanote ../emanote/ \
+            --show-trace
 
   # TODO: Use self-hosted runner
   website:
diff --git a/nix/flake-module.nix b/nix/flake-module.nix
index 14c30bdc5..2fcb0999e 100644
--- a/nix/flake-module.nix
+++ b/nix/flake-module.nix
@@ -47,6 +47,7 @@ in
                               type = types.str;
                               description = ''Like `path` but local (not in Nix store)'';
                               default = builtins.toString config.path;
+                              defaultText = lib.literalMD "toString path";
                             };
                             mountPoint = mkOption {
                               type = types.nullOr types.str;
@@ -57,15 +58,19 @@ in
                               type = types.str;
                               description = ''Layer spec'';
                               readOnly = true;
-                              default = if config.mountPoint == null then "${config.path}" else "${config.path}@${config.mountPoint}";
                             };
                             outputs.layerString = mkOption {
                               type = types.str;
                               description = ''Layer spec'';
                               readOnly = true;
-                              default = if config.mountPoint == null then config.pathString else "${config.pathString}@${config.mountPoint}";
                             };
                           };
+                          config = {
+                            outputs.layer =
+                              if config.mountPoint == null then "${config.path}" else "${config.path}@${config.mountPoint}";
+                            outputs.layerString =
+                              if config.mountPoint == null then config.pathString else "${config.pathString}@${config.mountPoint}";
+                          };
                         }));
                       };
                       # TODO: Consolidate all these options below with those of home-manager-module.nix