diff --git a/lisainstrument/instrument.py b/lisainstrument/instrument.py
index c625da8779cc6de01c04e1be077494d0fba585b3..2b6ee9e0972ae7ca12ecf6ba8c05ca8d42dc3361 100755
--- a/lisainstrument/instrument.py
+++ b/lisainstrument/instrument.py
@@ -145,10 +145,10 @@ class Instrument:
             tdir_tone: 3-tuple (amplitude [Hz], frequency [Hz], initial phase [rad]) of dictionaries
                 for parameters of TDIR assistance tone, or None
             clock_asds: dictionary of clock noise amplitude spectral densities
-            clock_offsets: dictionary of clock offsets
+            clock_offsets: dictionary of clock offsets from TPS [s]
             clock_freqoffsets: dictionary of clock frequency offsets [s^-1], or 'default'
             clock_freqlindrifts: dictionary of clock frequency linear drifts [s^-2], or 'default'
-            clock_freqquaddrifts: dictionary of clock frequency quadratic drifts [s^-2], or 'default'
+            clock_freqquaddrifts: dictionary of clock frequency quadratic drifts [s^-3], or 'default'
             clockinv_tolerance: convergence tolerance for clock noise inversion [s]
             clockinv_maxiter: maximum number of iterations for clock noise inversion
             backlink_asds: dictionary of amplitude spectral densities for backlink noise [m/sqrt(Hz)]