diff --git a/gps/sap.conf b/gps/sap.conf
index 22b62ff..2a19917 100644
--- a/gps/sap.conf
+++ b/gps/sap.conf
@@ -1,10 +1,12 @@
 ################################
 # Sensor Settings
 ################################
-
-# Needs to be set explicitly based on sensor
-# There is no default value.
-# used in loc_eng_reinit
+#The following parameters are optional.
+#Internal defaults support MEMS sensors
+#native to most handset devices.
+#Device specific sensor characterization
+#for improved performance is possible as
+#described in SAP application notes.
 #GYRO_BIAS_RANDOM_WALK=
 #ACCEL_RANDOM_WALK_SPECTRAL_DENSITY=
 #ANGLE_RANDOM_WALK_SPECTRAL_DENSITY=
@@ -40,3 +42,12 @@ SENSOR_PROVIDER=1
 #  0x0 - ENABLE_INS_POSITIONING_FILTER
 SENSOR_ALGORITHM_CONFIG_MASK=0x0
 
+# Time source used by Sensor HAL
+# Setting this value controls accuracy of location sensor services.
+#  0 - Unknown
+#  1 - CLOCK_BOOTTIME
+#  2 - CLOCK_MONOTONIC
+#  3 - CLOCK_REALTIME
+#  4 - CLOCK_BOOTTIME using Alarm timer interface
+NDK_PROVIDER_TIME_SOURCE=1
+