diff --git a/pyhealth/tasks/drug_recommendation.py b/pyhealth/tasks/drug_recommendation.py
index d423d51d..17c0939a 100644
--- a/pyhealth/tasks/drug_recommendation.py
+++ b/pyhealth/tasks/drug_recommendation.py
@@ -114,7 +114,7 @@ def drug_recommendation_mimic4_fn(patient: Patient):
         >>> from pyhealth.datasets import MIMIC4Dataset
         >>> mimic4_base = MIMIC4Dataset(
         ...     root="/srv/local/data/physionet.org/files/mimiciv/2.0/hosp",
-        ...     tables=["diagnoses_icd", "procedures_icd"],
+        ...     tables=["diagnoses_icd", "procedures_icd", "prescriptions"],
         ...     code_mapping={"ICD10PROC": "CCSPROC"},
         ... )
         >>> from pyhealth.tasks import drug_recommendation_mimic4_fn
diff --git a/pyhealth/tasks/length_of_stay_prediction.py b/pyhealth/tasks/length_of_stay_prediction.py
index eaa7b996..3464f37e 100644
--- a/pyhealth/tasks/length_of_stay_prediction.py
+++ b/pyhealth/tasks/length_of_stay_prediction.py
@@ -105,7 +105,7 @@ def length_of_stay_prediction_mimic4_fn(patient: Patient):
         >>> from pyhealth.datasets import MIMIC4Dataset
         >>> mimic4_base = MIMIC4Dataset(
         ...     root="/srv/local/data/physionet.org/files/mimiciv/2.0/hosp",
-        ...     tables=["diagnoses_icd", "procedures_icd"],
+        ...     tables=["diagnoses_icd", "procedures_icd", "prescriptions"],
         ...     code_mapping={"ICD10PROC": "CCSPROC"},
         ... )
         >>> from pyhealth.tasks import length_of_stay_prediction_mimic4_fn
diff --git a/pyhealth/tasks/mortality_prediction.py b/pyhealth/tasks/mortality_prediction.py
index 3661540b..d89f2cda 100644
--- a/pyhealth/tasks/mortality_prediction.py
+++ b/pyhealth/tasks/mortality_prediction.py
@@ -82,7 +82,7 @@ def mortality_prediction_mimic4_fn(patient: Patient):
         >>> from pyhealth.datasets import MIMIC4Dataset
         >>> mimic4_base = MIMIC4Dataset(
         ...     root="/srv/local/data/physionet.org/files/mimiciv/2.0/hosp",
-        ...     tables=["diagnoses_icd", "procedures_icd"],
+        ...     tables=["diagnoses_icd", "procedures_icd", "prescriptions"],
         ...     code_mapping={"ICD10PROC": "CCSPROC"},
         ... )
         >>> from pyhealth.tasks import mortality_prediction_mimic4_fn
diff --git a/pyhealth/tasks/readmission_prediction.py b/pyhealth/tasks/readmission_prediction.py
index 9d04b5eb..85a1c093 100644
--- a/pyhealth/tasks/readmission_prediction.py
+++ b/pyhealth/tasks/readmission_prediction.py
@@ -86,7 +86,7 @@ def readmission_prediction_mimic4_fn(patient: Patient, time_window=15):
         >>> from pyhealth.datasets import MIMIC4Dataset
         >>> mimic4_base = MIMIC4Dataset(
         ...     root="/srv/local/data/physionet.org/files/mimiciv/2.0/hosp",
-        ...     tables=["diagnoses_icd", "procedures_icd"],
+        ...     tables=["diagnoses_icd", "procedures_icd", "prescriptions"],
         ...     code_mapping={"ICD10PROC": "CCSPROC"},
         ... )
         >>> from pyhealth.tasks import readmission_prediction_mimic4_fn