diff --git a/config.yaml b/config.yaml
index 49cfed3e..014881b4 100644
--- a/config.yaml
+++ b/config.yaml
@@ -44,8 +44,8 @@ PHONE_DATA_CONFIGURATION:
     DATABASE_GROUP: *database_group
     DEVICE_ID_COLUMN: device_id # column name
   TIMEZONE: 
-    TYPE: SINGLE # SINGLE or MULTIPLE
-    VALUE: *timezone # IF TYPE=SINGLE, see docs
+    TYPE: SINGLE
+    VALUE: *timezone
 
 # Sensors ------
 
@@ -351,9 +351,13 @@ FITBIT_STEPS_INTRADAY:
 #                                                 PLOTS                                                                #
 ########################################################################################################################
 
+# Data quality
 HISTOGRAM_PHONE_DATA_YIELD:
   PLOT: False
 
+HEATMAP_PHONE_DATA_YIELD_PER_PARTICIPANT_PER_TIME_SEGMENT:
+  PLOT: False
+
 HEATMAP_SENSORS_PER_MINUTE_PER_TIME_SEGMENT:
   PLOT: False
 
@@ -361,9 +365,7 @@ HEATMAP_SENSOR_ROW_COUNT_PER_TIME_SEGMENT:
   PLOT: False
   SENSORS: [PHONE_ACCELEROMETER, PHONE_ACTIVITY_RECOGNITION, PHONE_APPLICATIONS_FOREGROUND, PHONE_BATTERY, PHONE_BLUETOOTH, PHONE_CALLS, PHONE_CONVERSATION, PHONE_LIGHT, PHONE_LOCATIONS, PHONE_MESSAGES, PHONE_SCREEN, PHONE_WIFI_CONNECTED, PHONE_WIFI_VISIBLE]
 
-HEATMAP_PHONE_DATA_YIELD_PER_PARTICIPANT_PER_TIME_SEGMENT:
-  PLOT: False
-
+# Features
 HEATMAP_FEATURE_CORRELATION_MATRIX:
   PLOT: False
   MIN_ROWS_RATIO: 0.5