diff --git a/README.rst b/README.rst
index 5bacd89..bb8227c 100644
--- a/README.rst
+++ b/README.rst
@@ -7,6 +7,9 @@ intermediate representation of correlation functions.  It provides:
  - basis functions and singular values are accurate to full precision
  - routines for sparse sampling
 
+sparse-ir is part of the `sparse-ir ecosystem`_ (overview, history of IR and DLR,
+notation, and the Julia, Rust, C and Fortran libraries), maintained by `SpM-lab`_.
+
 
 Installation
 ------------
@@ -63,7 +66,9 @@ G(iν) = ∫₀^β dτ e^{iντ} G(τ); and G(τ) is evaluated for τ in [-β, 
 There is also a `Julia library`_ and (currently somewhat restricted)
 `C library with Fortran bindings`_ available for the IR basis and sparse sampling.
 
-.. _comprehensive tutorial: https://spm-lab.github.io/sparse-ir-tutorial-v2/
+.. _comprehensive tutorial: https://spm-lab.github.io/sparse-ir-tutorial/
+.. _sparse-ir ecosystem: https://spm-lab.github.io/sparse-ir-doc/
+.. _SpM-lab: https://spm-lab.github.io/
 .. _API documentation: https://sparse-ir.readthedocs.io
 .. _notation page: https://spm-lab.github.io/sparse-ir-doc/src/notation.html
 .. _Julia library: https://github.com/SpM-lab/SparseIR.jl
diff --git a/doc/conf.py b/doc/conf.py
index ec7dcbe..0c1a4dc 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -54,3 +54,9 @@ def get_version():
     ]
 
 html_theme = "sphinx_rtd_theme"
+
+# Navigation banner shared by the sparse-ir documentation sites; the links are
+# maintained in SpM-lab/SpM-lab.github.io.
+html_js_files = [
+    ("https://spm-lab.github.io/assets/ecosystem-banner.js", {"defer": "defer"}),
+    ]
diff --git a/doc/tutorial.rst b/doc/tutorial.rst
index 39b0e0f..9209e5c 100644
--- a/doc/tutorial.rst
+++ b/doc/tutorial.rst
@@ -2,7 +2,7 @@ Getting started
 ===============
 
 A comprehensive introduction is available at
-`<https://spm-lab.github.io/sparse-ir-tutorial-v2/>`_.
+`<https://spm-lab.github.io/sparse-ir-tutorial/>`_.
 
 It includes a set of self-contained notebooks for a variety of
 many-body applications using sparse-ir: