Passage 1.29.12
γεγραμμένοι δέ εἰσιν οἵ τε στρατηγοὶ πλὴν Νικίου, καὶ τῶν στρατιωτῶν ὁμοῦ τοῖς ἀστοῖς Πλαταιεῖς· Νικίας δὲ ἐπὶ τῷδε παρείθη, γράφω δὲ οὐδὲν διάφορα ἢ Φίλιστος, ὃς ἔφη Δημοσθένην μὲν σπονδὰς ποιήσασθαι τοῖς ἄλλοις πλὴν αὑτοῦ καὶ ὡς ἡλίσκετο αὑτὸν ἐπιχειρεῖν ἀποκτεῖναι, Νικίᾳ δὲ τὴν παράδοσιν ἐθελοντῇ γενέσθαι· τούτων ἕνεκα οὐκ ἐνεγράφη Νικίας τῇ στήλῃ, καταγνωσθεὶς αἰχμάλωτος ἐθελοντὴς εἶναι καὶ οὐκ ἀνὴρ πολέμῳ πρέπων.
Inscribed upon the monument are the names of all the generals except Nicias, as well as those of the Plataean soldiers who fought alongside the citizens. Nicias was excluded for the following reason—and here my account does not differ from that of Philistus, who claimed that Demosthenes arranged terms of surrender for all except himself and, when he was about to be captured, attempted suicide. Nicias, however, willingly surrendered himself. Because of this, Nicias was not recorded on the stele, having been judged a voluntary captive and a man ill-suited to warfare.