diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
new file mode 100644
index 0000000..b0e4394
--- /dev/null
+++ b/.github/workflows/CI.yml
@@ -0,0 +1,69 @@
+name: CI
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+permissions:
+  actions: write
+  contents: read
+jobs:
+  test:
+    name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        version:
+          - 'lts'
+          - '1'
+        os:
+          - ubuntu-latest
+        arch:
+          - x64
+    steps:
+      - uses: actions/checkout@v4
+      - uses: julia-actions/setup-julia@v2
+        with:
+          version: ${{ matrix.version }}
+          arch: ${{ matrix.arch }}
+      - name: Add Julia Registries
+        run: |
+          julia -e '
+          using Pkg
+          Pkg.Registry.add(
+            RegistrySpec(url = "https://github.com/tensor4all/T4ARegistry.git")
+          )'
+      - uses: julia-actions/cache@v2
+      - uses: julia-actions/julia-buildpkg@v1
+      - uses: julia-actions/julia-runtest@v1
+      - uses: julia-actions/julia-processcoverage@v1
+      - uses: codecov/codecov-action@v3
+
+  docs:
+    name: Documentation
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: julia-actions/setup-julia@v2
+        with:
+          version: '1'
+      - name: Add Julia Registries
+        run: |
+          julia -e '
+          using Pkg
+          Pkg.Registry.add(
+            RegistrySpec(url = "https://github.com/tensor4all/T4ARegistry.git")
+          )'
+      - uses: julia-actions/julia-buildpkg@v1
+      - uses: julia-actions/julia-docdeploy@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          DOCUMENTER_KEY: ${{ secrets.DOCUMENTER_KEY }}
+
+
diff --git a/.github/workflows/CompatHelper.yml b/.github/workflows/CompatHelper.yml
new file mode 100644
index 0000000..bbacdd1
--- /dev/null
+++ b/.github/workflows/CompatHelper.yml
@@ -0,0 +1,18 @@
+name: CompatHelper
+on:
+  schedule:
+    - cron: 0 0 * * *
+  workflow_dispatch:
+jobs:
+  CompatHelper:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Pkg.add("CompatHelper")
+        run: julia -e 'using Pkg; Pkg.add("CompatHelper")'
+      - name: CompatHelper.main()
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          COMPATHELPER_PRIV: ${{ secrets.DOCUMENTER_KEY }}
+        run: julia -e 'using CompatHelper; CompatHelper.main()'
+
+
diff --git a/.github/workflows/TagBot.yml b/.github/workflows/TagBot.yml
new file mode 100644
index 0000000..12917b5
--- /dev/null
+++ b/.github/workflows/TagBot.yml
@@ -0,0 +1,33 @@
+name: TagBot
+on:
+  issue_comment:
+    types:
+      - created
+  workflow_dispatch:
+    inputs:
+      lookback:
+        default: "3"
+permissions:
+  actions: read
+  checks: read
+  contents: write
+  deployments: read
+  issues: read
+  discussions: read
+  packages: read
+  pages: read
+  pull-requests: read
+  repository-projects: read
+  security-events: read
+  statuses: read
+jobs:
+  TagBot:
+    if: github.event_name == 'workflow_dispatch' || github.actor == 'JuliaTagBot'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: JuliaRegistries/TagBot@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          ssh: ${{ secrets.DOCUMENTER_KEY }}
+
+
diff --git a/.gitignore b/.gitignore
index bd54414..54c1515 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,3 +12,6 @@ docs/build/
 
 # Local logs (do not commit)
 *.log
+/docs/Manifest.toml
+/docs/*.log
+/docs_build.log
diff --git a/docs/Project.toml b/docs/Project.toml
new file mode 100644
index 0000000..d214956
--- /dev/null
+++ b/docs/Project.toml
@@ -0,0 +1,9 @@
+[deps]
+Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
+T4ATensorTrain = "ec6ec972-96ae-4a21-b859-3911b77e305f"
+
+[compat]
+Documenter = "1"
+julia = "1.10"
+
+
diff --git a/docs/make.jl b/docs/make.jl
new file mode 100644
index 0000000..300ce63
--- /dev/null
+++ b/docs/make.jl
@@ -0,0 +1,20 @@
+using Pkg
+
+Pkg.activate(@__DIR__)
+Pkg.develop(PackageSpec(path=joinpath(@__DIR__, "..")))
+Pkg.instantiate()
+
+using Documenter
+using T4ATensorTrain
+
+makedocs(
+    modules=[T4ATensorTrain],
+    sitename="T4ATensorTrain.jl",
+)
+
+deploydocs(
+    repo="github.com/tensor4all/T4ATensorTrain.jl.git",
+    devbranch="main",
+)
+
+
diff --git a/docs/src/index.md b/docs/src/index.md
new file mode 100644
index 0000000..a85d403
--- /dev/null
+++ b/docs/src/index.md
@@ -0,0 +1,11 @@
+# T4ATensorTrain.jl
+
+Tensor Train core functionality for tensor4all.
+
+## API
+
+```@autodocs
+Modules = [T4ATensorTrain]
+```
+
+
diff --git a/src/tensortrain.jl b/src/tensortrain.jl
index d9f2161..0075af4 100644
--- a/src/tensortrain.jl
+++ b/src/tensortrain.jl
@@ -57,7 +57,7 @@ end
 
 Convert a tensor-train-like object into a tensor train.
 
-See also: [`TensorCI1`](@ref), [`TensorCI2`](@ref).
+See also: `TensorCI1` and `TensorCI2` in `T4ATensorCI.jl`.
 """
 function TensorTrain(tci::AbstractTensorTrain{V})::TensorTrain{V,3} where {V}
     return TensorTrain{V,3}(sitetensors(tci))