diff --git a/lisainstrument/instrument.py b/lisainstrument/instrument.py
index 7c030ecb7fad0b17046814361dc456c6554433d1..27786fead1287b41490f5a3208db36a5c061ce7b 100755
--- a/lisainstrument/instrument.py
+++ b/lisainstrument/instrument.py
@@ -88,7 +88,7 @@ class Instrument:
                  backlink_asds=3E-12, backlink_fknees=2E-3, testmass_asds=2.4E-15, testmass_fknees=0.4E-3,
                  oms_asds=(6.35E-12, 1.25E-11, 1.42E-12, 3.38E-12, 3.32E-12, 7.90E-12), oms_fknees=2E-3,
                  # TCB synchronization
-                 sync_asds=2.2E-3,
+                 sync_asds=0.42,
                  # Tilt-to-length (TTL)
                  ttl_coeffs='default',
                  sc_jitter_asds=(5E-9, 5E-9, 5E-9), mosa_jitter_asds=(2E-9, 1e-9), mosa_angles='default',
@@ -154,7 +154,8 @@ class Instrument:
             testmass_fknees: dictionary of cutoff frequencies for test-mass noise [Hz]
             oms_asds: tuple of dictionaries of amplitude spectral densities for OMS noise [m/sqrt(Hz)],
                 ordered as (isi_carrier, isi_usb, tmi_carrier, tmi_usb, rfi_carrier, rfi_usb)
-            sync_asds: dictionary of amplitude spectral densities for TCB synchronization noise [s/sqrt(Hz)]
+            sync_asds: dictionary of amplitude spectral densities for TCB synchronization noise [s/sqrt(Hz)],
+                the default ASD seems rather high, this is due to the small sampling rate (default 1 / 86400s)
             oms_fknees: dictionary of cutoff frequencies for OMS noise
             ttl_coeffs: tuple (local_phi, distant_phi, local_eta, distant_eta) of dictionaries of
                 tilt-to-length coefficients on each MOSA [m/rad], 'default' for a default set of