diff --git a/docs/source/business_ch16_seasonality_baselines.rst b/docs/source/business_ch16_seasonality_baselines.rst
index eb6994c..77c3c39 100644
--- a/docs/source/business_ch16_seasonality_baselines.rst
+++ b/docs/source/business_ch16_seasonality_baselines.rst
@@ -1,3 +1,6 @@
+.. |trackd_run| replace:: d16
+.. include:: _includes/track_d_run_strip.rst
+
 Track D — Chapter 16
 ====================
 
diff --git a/docs/source/business_ch17_revenue_forecasting_segmentation_drivers.rst b/docs/source/business_ch17_revenue_forecasting_segmentation_drivers.rst
index f44799b..5502adf 100644
--- a/docs/source/business_ch17_revenue_forecasting_segmentation_drivers.rst
+++ b/docs/source/business_ch17_revenue_forecasting_segmentation_drivers.rst
@@ -1,3 +1,6 @@
+.. |trackd_run| replace:: d17
+.. include:: _includes/track_d_run_strip.rst
+
 Track D — Chapter 17
 ====================
 
diff --git a/docs/source/business_ch18_expense_forecasting_fixed_variable_step_payroll.rst b/docs/source/business_ch18_expense_forecasting_fixed_variable_step_payroll.rst
index 8a5a60d..19d74a2 100644
--- a/docs/source/business_ch18_expense_forecasting_fixed_variable_step_payroll.rst
+++ b/docs/source/business_ch18_expense_forecasting_fixed_variable_step_payroll.rst
@@ -1,3 +1,6 @@
+.. |trackd_run| replace:: d18
+.. include:: _includes/track_d_run_strip.rst
+
 Track D — Chapter 18
 ====================
 
diff --git a/docs/source/business_ch19_cash_flow_forecasting_direct_method_13_week.rst b/docs/source/business_ch19_cash_flow_forecasting_direct_method_13_week.rst
index 05b1958..84a2a28 100644
--- a/docs/source/business_ch19_cash_flow_forecasting_direct_method_13_week.rst
+++ b/docs/source/business_ch19_cash_flow_forecasting_direct_method_13_week.rst
@@ -1,3 +1,6 @@
+.. |trackd_run| replace:: d19
+.. include:: _includes/track_d_run_strip.rst
+
 Track D — Chapter 19
 ====================
 
diff --git a/docs/source/business_ch20_integrated_forecasting_three_statements.rst b/docs/source/business_ch20_integrated_forecasting_three_statements.rst
index dc375fb..e42271a 100644
--- a/docs/source/business_ch20_integrated_forecasting_three_statements.rst
+++ b/docs/source/business_ch20_integrated_forecasting_three_statements.rst
@@ -1,3 +1,6 @@
+.. |trackd_run| replace:: d20
+.. include:: _includes/track_d_run_strip.rst
+
 Track D — Chapter 20
 ====================
 
diff --git a/tests/test_workbook_track_d_runstrip_ch16_20.py b/tests/test_workbook_track_d_runstrip_ch16_20.py
new file mode 100644
index 0000000..ca2996b
--- /dev/null
+++ b/tests/test_workbook_track_d_runstrip_ch16_20.py
@@ -0,0 +1,22 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+
+def test_track_d_ch16_20_runstrip_present() -> None:
+    """Guardrail: Track D Ch16–Ch20 docs include the PyPI run-strip."""
+
+    docs = Path("docs/source")
+
+    cases = {
+        "business_ch16_seasonality_baselines.rst": "d16",
+        "business_ch17_revenue_forecasting_segmentation_drivers.rst": "d17",
+        "business_ch18_expense_forecasting_fixed_variable_step_payroll.rst": "d18",
+        "business_ch19_cash_flow_forecasting_direct_method_13_week.rst": "d19",
+        "business_ch20_integrated_forecasting_three_statements.rst": "d20",
+    }
+
+    for rel, run_id in cases.items():
+        text = (docs / rel).read_text(encoding="utf-8")
+        assert ".. include:: _includes/track_d_run_strip.rst" in text
+        assert f".. |trackd_run| replace:: {run_id}" in text