GO:0070183:   mitochondrial tryptophanyl-tRNA aminoacylation
The process of coupling tryptophan to tryptophanyl-tRNA in a mitochondrion, catalyzed by tryptophanyl-tRNA synthetase. In tRNA aminoacylation, the amino acid is first activated by linkage to AMP and then transferred to either the 2"- or the 3"-hydroxyl group of the 3"-adenosine residue of the tRNA.