diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index ac1560a..d486ff7 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -2,7 +2,7 @@
 
 version: 2
 updates:
-  - package-ecosystem: "github-actions"
+  - package-ecosystem: github-actions
     directory: "/"
     schedule:
       interval: "weekly"
diff --git a/.github/workflows/CompatHelper.yml b/.github/workflows/CompatHelper.yml
index 9b00c12..e4ee926 100644
--- a/.github/workflows/CompatHelper.yml
+++ b/.github/workflows/CompatHelper.yml
@@ -19,7 +19,7 @@ jobs:
         uses: julia-actions/setup-julia@latest
         with:
           version: '1'
-          arch: ${{ runner.arch }}
+          # arch: ${{ runner.arch }}
         if: steps.julia_in_path.outcome != 'success'
       - name: "Add the General registry via Git"
         run: |
@@ -43,3 +43,6 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           COMPATHELPER_PRIV: ${{ secrets.DOCUMENTER_KEY }}
+
+# based on:
+# https://github.com/JuliaRegistries/CompatHelper.jl
diff --git a/.github/workflows/Documentation.yml b/.github/workflows/Documentation.yml
index debd2c6..390476b 100644
--- a/.github/workflows/Documentation.yml
+++ b/.github/workflows/Documentation.yml
@@ -20,7 +20,7 @@ jobs:
       - uses: julia-actions/setup-julia@latest
         with:
           version: '1'
-      - name: Cache artifacts
+      - name: CacheArtifacts
         uses: actions/cache@v4
         env:
           cache-name: cache-artifacts
@@ -31,7 +31,7 @@ jobs:
             ${{ runner.os }}-test-${{ env.cache-name }}-
             ${{ runner.os }}-test-
             ${{ runner.os }}-
-      - name: Install dependencies
+      - name: InstallDependencies
         run: |
           julia --project=docs/ -e '
             ENV["JULIA_PKG_SERVER"] = ""
diff --git a/.github/workflows/SpellCheck.yml b/.github/workflows/SpellCheck.yml
new file mode 100644
index 0000000..c344f6d
--- /dev/null
+++ b/.github/workflows/SpellCheck.yml
@@ -0,0 +1,13 @@
+name: Spell Check
+
+on: [pull_request]
+
+jobs:
+  typos-check:
+    name: Spell Check with Typos
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Actions Repository
+        uses: actions/checkout@v4
+      - name: Check spelling
+        uses: crate-ci/typos@master
diff --git a/.github/workflows/TagBot.yml b/.github/workflows/TagBot.yml
index f49313b..6d2efc1 100644
--- a/.github/workflows/TagBot.yml
+++ b/.github/workflows/TagBot.yml
@@ -1,9 +1,11 @@
 name: TagBot
+
 on:
   issue_comment:
     types:
       - created
   workflow_dispatch:
+
 jobs:
   TagBot:
     if: github.event_name == 'workflow_dispatch' || github.actor == 'JuliaTagBot'
diff --git a/Project.toml b/Project.toml
index c565f47..57571fa 100644
--- a/Project.toml
+++ b/Project.toml
@@ -7,5 +7,5 @@ LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 Polynomials = "f27b6e38-b328-58d1-80ce-0feddd5e7a45"
 
 [compat]
-Polynomials = "1, 2, 3"
+Polynomials = "1, 2, 3, 4"
 julia = "1.6"
diff --git a/docs/inc/reproduce.jl b/docs/inc/reproduce.jl
new file mode 100644
index 0000000..8b64f28
--- /dev/null
+++ b/docs/inc/reproduce.jl
@@ -0,0 +1,9 @@
+
+# ### Reproducibility
+
+# This page was generated with the following version of Julia:
+using InteractiveUtils: versioninfo
+io = IOBuffer(); versioninfo(io); split(String(take!(io)), '\n')
+
+# And with the following package versions
+import Pkg; Pkg.status()
diff --git a/docs/inc/urls.jl b/docs/inc/urls.jl
new file mode 100644
index 0000000..0aab175
--- /dev/null
+++ b/docs/inc/urls.jl
@@ -0,0 +1,14 @@
+
+#=
+This page comes from a single Julia file:
+[`@__NAME__.jl`](xxxrepo/@__NAME__.jl).
+
+You can access the source code
+for such Julia documentation
+using the 'Edit on GitHub' link in the top right.
+You can view the corresponding notebook in
+[nbviewer](https://nbviewer.org/) here:
+[`@__NAME__.ipynb`](xxxnb/@__NAME__.ipynb),
+or open it in [binder](https://mybinder.org/) here:
+[`@__NAME__.ipynb`](xxxbinder/@__NAME__.ipynb).
+=#
diff --git a/docs/lit/examples/1-overview.jl b/docs/lit/examples/1-overview.jl
index 1b119b4..5bb2965 100644
--- a/docs/lit/examples/1-overview.jl
+++ b/docs/lit/examples/1-overview.jl
@@ -17,6 +17,9 @@ supports
 Toeplitz, Hankel, and circulant matrices.
 =#
 
+#srcURL
+
+
 # ### Setup
 
 # Packages needed here.
@@ -88,6 +91,7 @@ Kahan(5, 3, 0.5, 0)
 #
 Kahan(3, 5, 0.5, 1e-3)
 
+
 #=
 ## `Riemann` matrix
 
@@ -140,3 +144,6 @@ V \ a
 
 #
 V' \ V[3,:]
+
+
+include("../../../inc/reproduce.jl")
diff --git a/docs/make.jl b/docs/make.jl
index 0ee5bed..c6c10bf 100644
--- a/docs/make.jl
+++ b/docs/make.jl
@@ -2,8 +2,8 @@ execute = isempty(ARGS) || ARGS[1] == "run"
 
 org, reps = :JuliaLinearAlgebra, :SpecialMatrices
 eval(:(using $reps))
-using Documenter
-using Literate
+import Documenter
+import Literate
 
 # https://juliadocs.github.io/Documenter.jl/stable/man/syntax/#@example-block
 ENV["GKSwstype"] = "100"
@@ -15,8 +15,7 @@ src = joinpath(@__DIR__, "src")
 gen = joinpath(@__DIR__, "src/generated")
 
 base = "$org/$reps.jl"
-repo_root_url =
-    "https://github.com/$base/blob/main"
+repo_root_url = "https://github.com/$base/blob/main"
 nbviewer_root_url =
     "https://nbviewer.org/github/$base/tree/gh-pages/dev/generated/examples"
 binder_root_url =
@@ -24,16 +23,43 @@ binder_root_url =
 
 
 repo = eval(:($reps))
-DocMeta.setdocmeta!(repo, :DocTestSetup, :(using $reps); recursive=true)
+Documenter.DocMeta.setdocmeta!(repo, :DocTestSetup, :(using $reps); recursive=true)
+
+# preprocessing
+inc1 = "include(\"../../../inc/reproduce.jl\")"
+
+function prep_markdown(str, root, file)
+    inc_read(file) = read(joinpath("docs/inc", file), String)
+    repro = inc_read("reproduce.jl")
+    str = replace(str, inc1 => repro)
+    urls = inc_read("urls.jl")
+    file = joinpath(splitpath(root)[end], splitext(file)[1])
+    tmp = splitpath(root)[end-3:end] # docs lit demos 00
+    urls = replace(urls,
+        "xxxrepo" => joinpath(repo_root_url, tmp...),
+        "xxxnb" => joinpath(nbviewer_root_url, tmp[end]),
+        "xxxbinder" => joinpath(binder_root_url, tmp[end]),
+    )
+    str = replace(str, "#srcURL" => urls)
+end
+
+function prep_notebook(str)
+    str = replace(str, inc1 => "", "#srcURL" => "")
+end
 
 for (root, _, files) in walkdir(lit), file in files
     splitext(file)[2] == ".jl" || continue # process .jl files only
     ipath = joinpath(root, file)
     opath = splitdir(replace(ipath, lit => gen))[1]
-    Literate.markdown(ipath, opath; documenter = execute, # run examples
-        repo_root_url, nbviewer_root_url, binder_root_url)
-    Literate.notebook(ipath, opath; execute = false, # no-run notebooks
-        repo_root_url, nbviewer_root_url, binder_root_url)
+    Literate.markdown(ipath, opath;
+        repo_root_url,
+        preprocess = str -> prep_markdown(str, root, file),
+        documenter = execute, # run examples
+    )
+    Literate.notebook(ipath, opath;
+        preprocess = prep_notebook,
+        execute = false, # no-run notebooks
+    )
 end
 
 
@@ -48,10 +74,10 @@ format = Documenter.HTML(;
     prettyurls = isci,
     edit_link = "main",
     canonical = "https://$org.github.io/$repo.jl/stable/",
-#   assets = String[],
+    assets = ["assets/custom.css"],
 )
 
-makedocs(;
+Documenter.makedocs(;
     modules = [repo],
     sitename = "$repo.jl",
     format,
@@ -63,7 +89,7 @@ makedocs(;
 )
 
 if isci
-    deploydocs(;
+    Documenter.deploydocs(;
         repo = "github.com/$base",
         devbranch = "main",
         devurl = "dev",
diff --git a/docs/src/assets/custom.css b/docs/src/assets/custom.css
new file mode 100644
index 0000000..31e6549
--- /dev/null
+++ b/docs/src/assets/custom.css
@@ -0,0 +1,3 @@
+.docs-sourcelink {
+    opacity:1 !important;
+}