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@@ -36,6 +36,7 @@ The configuration dictionary contains the following entries
 'l_ref': float, # reference length (usually half root chord)
 'mach': float, # freestream Mach number
 'n_modes': int, # number of modes
+'g_struct': float, # structural damping (complex proportional stiffness)
 'rho_ks': float, # aggregation parameter for KS
 'method': str, # method type ('pk' or 'nipk')
 'vrb': int # verbosity level