diff --git a/tutorials/colors/colors.py b/tutorials/colors/colors.py
index 77935a9555ba..b8d81eee3f08 100644
--- a/tutorials/colors/colors.py
+++ b/tutorials/colors/colors.py
@@ -15,9 +15,11 @@
case-insensitive);
* a string representation of a float value in ``[0, 1]`` inclusive for gray
level (e.g., ``'0.5'``);
-* one of ``{'b', 'g', 'r', 'c', 'm', 'y', 'k', 'w'}``, they are the single
- character short-hand notations for blue, green, red, cyan, magenta, yellow,
- black, and white.
+* one of the characters ``{'b', 'g', 'r', 'c', 'm', 'y', 'k', 'w'}``, which
+ are short-hand notations for shades of blue, green, red, cyan, magenta,
+ yellow, black, and white. Note that the colors ``'g', 'c', 'm', 'y'`` do not
+ coincide with the X11/CSS4 colors. Their particular shades were chosen for
+ better visibility of colored lines against typical backgrounds.
* a X11/CSS4 color name (case-insensitive);
* a name from the `xkcd color survey`_, prefixed with ``'xkcd:'`` (e.g.,
``'xkcd:sky blue'``; case insensitive);
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