diff --git a/docs/reference/commands/5ttgen.rst b/docs/reference/commands/5ttgen.rst
index 72f5925ef5..3a8faa7d62 100644
--- a/docs/reference/commands/5ttgen.rst
+++ b/docs/reference/commands/5ttgen.rst
@@ -130,7 +130,7 @@ Example usages
 
         $ python3 -c "import ants, antspynet, nibabel, numpy; inpath = 'T1w.nii.gz'; t1w_ants = ants.image_read(inpath); t1w_nib = nibabel.load(inpath); result = antspynet.deep_atropos(t1w_ants); prob_maps = numpy.stack([numpy.array(img.numpy()) for img in result['probability_images']], axis=-1); nibabel.save(nibabel.Nifti1Image(prob_maps, t1w_nib.affine), 'probabilities.nii.gz')"; 5ttgen deep_atropos probabilities.nii.gz 5tt_probabilities.mif
 
-    In this use case, the poerior probabilities of these tissue classes are interpreted as partial volume fractions and imported into the derivative 5TT image appropriately.
+    In this use case, the posterior probabilities of these tissue classes are interpreted as partial volume fractions and imported into the derivative 5TT image appropriately.
 
 Options
 -------
diff --git a/python/mrtrix3/commands/5ttgen/deep_atropos.py b/python/mrtrix3/commands/5ttgen/deep_atropos.py
index 88b129fca7..a3cf5871bf 100644
--- a/python/mrtrix3/commands/5ttgen/deep_atropos.py
+++ b/python/mrtrix3/commands/5ttgen/deep_atropos.py
@@ -58,7 +58,7 @@ def usage(base_parser, subparsers):  #pylint: disable=unused-variable
                                        'prob_maps = numpy.stack([numpy.array(img.numpy()) for img in result[\'probability_images\']], axis=-1); '
                                        'nibabel.save(nibabel.Nifti1Image(prob_maps, t1w_nib.affine), \'probabilities.nii.gz\')"; '
                            '5ttgen deep_atropos probabilities.nii.gz 5tt_probabilities.mif',
-                           'In this use case, the poerior probabilities of these tissue classes are interpreted as partial volume fractions '
+                           'In this use case, the posterior probabilities of these tissue classes are interpreted as partial volume fractions '
                            'and imported into the derivative 5TT image appropriately.')
   parser.add_argument('input',
     type=app.Parser.ImageIn(),