diff --git a/.idea/straw2analysis.iml b/.idea/straw2analysis.iml
index 594e7e8..89e730b 100644
--- a/.idea/straw2analysis.iml
+++ b/.idea/straw2analysis.iml
@@ -7,4 +7,8 @@
     <orderEntry type="jdk" jdkName="Python 3.9 (straw2analysis)" jdkType="Python SDK" />
     <orderEntry type="sourceFolder" forTests="false" />
   </component>
+  <component name="PyDocumentationSettings">
+    <option name="format" value="NUMPY" />
+    <option name="myDocStringFormat" value="NumPy" />
+  </component>
 </module>
\ No newline at end of file
diff --git a/features/communication.py b/features/communication.py
index eb4d536..97d985d 100644
--- a/features/communication.py
+++ b/features/communication.py
@@ -7,6 +7,19 @@ from setup import db_engine, session
 
 
 def get_call_data(usernames: List) -> pd.DataFrame:
+    """
+    Read the data from the calls table and return it in a dataframe.
+
+    Parameters
+    ----------
+    usernames: List
+        A list of usernames to put into the WHERE condition.
+
+    Returns
+    -------
+    df_calls: pd.DataFrame
+        A dataframe of call data.
+    """
     query_calls = (
         session.query(Call, Participant.username)
         .filter(Participant.id == Call.participant_id)
@@ -18,7 +31,19 @@ def get_call_data(usernames: List) -> pd.DataFrame:
 
 
 def enumerate_contacts(comm_df: pd.DataFrame) -> pd.DataFrame:
-    """" Count contacts (callers, senders) and enumerate them by their frequency. """
+    """
+    Count contacts (callers, senders) and enumerate them by their frequency.
+
+    Parameters
+    ----------
+    comm_df: pd.DataFrame
+        A dataframe of calls or SMSes.
+
+    Returns
+    -------
+    comm_df: pd.DataFrame
+        The altered dataframe with the column contact_id, arranged by frequency.
+    """
     contact_counts = (
         comm_df["trace"]
         .value_counts(sort=True, ascending=False)