diff --git a/setup.py b/setup.py
index 0c617fa6..4a751966 100644
--- a/setup.py
+++ b/setup.py
@@ -42,6 +42,9 @@
 INSTALL_REQUIRES = [
     'matplotlib >= 3.0.0',
     'numpy >= 1.17.3',
+    # pandas restricted to <2.1 until
+    # https://github.com/pandas-dev/pandas/issues/55794
+    # is resolved
     'pandas >= 1.3.0, <2.1',
     'statsmodels >= 0.11.0',
     'scipy >= 1.2.0',