diff --git a/src/scilpy/cli/scil_tractogram_assign_custom_color.py b/src/scilpy/cli/scil_tractogram_assign_custom_color.py
index 78ecefc09..a754d7fa2 100755
--- a/src/scilpy/cli/scil_tractogram_assign_custom_color.py
+++ b/src/scilpy/cli/scil_tractogram_assign_custom_color.py
@@ -119,8 +119,9 @@ def _build_arg_parser():
                     'approximation. Default if set is 4.')
     g2.add_argument('--colormap', default='jet',
                     help='Select the colormap for colored trk (dps/dpp) '
-                    '[%(default)s].\nUse two Matplotlib named color separeted '
-                    'by a - to create your own colormap.')
+                    '[%(default)s].\nYou may also use two Matplotlib named '
+                    'colors separated by a "- to\n create your own colormap. '
+                    'Ex: red-blue.')
     g2.add_argument('--clip_outliers', action='store_true',
                     help="If set, we will clip the outliers (first and last "
                          "5%% quantile). Strongly suggested if your data "
diff --git a/src/scilpy/cli/tests/test_tractogram_assign_custom_color.py b/src/scilpy/cli/tests/test_tractogram_assign_custom_color.py
index 66cdb82f4..c52ad4b04 100644
--- a/src/scilpy/cli/tests/test_tractogram_assign_custom_color.py
+++ b/src/scilpy/cli/tests/test_tractogram_assign_custom_color.py
@@ -38,7 +38,8 @@ def test_execution_along_profile(script_runner, monkeypatch):
     monkeypatch.chdir(os.path.expanduser(tmp_dir.name))
 
     ret = script_runner.run(['scil_tractogram_assign_custom_color',
-                             in_bundle, 'colored2.trk', '--along_profile'])
+                             in_bundle, 'colored2.trk', '--along_profile',
+                             '--colormap', 'red-blue'])
     assert ret.success
 
 
diff --git a/src/scilpy/viz/color.py b/src/scilpy/viz/color.py
index a76159b25..9a4b4ac11 100644
--- a/src/scilpy/viz/color.py
+++ b/src/scilpy/viz/color.py
@@ -87,8 +87,9 @@ def get_lookup_table(name):
     Parameters
     ----------
     name : str
-        Name of the lookup table (colormap) or a list of named colors
-        (separated by a -) to form a lookup table (colormap) from.
+        Name of the lookup table (colormap), ex, jet, or:
+        Two named colors separated by a -, ex, red-blue, to form a lookup
+        table (colormap) from.
 
     Returns
     -------