diff --git a/cc-by-sa/knowledge/glossary/terms/grade_axis/content.md b/cc-by-sa/knowledge/glossary/terms/grade_axis/content.md
index ff50c88f6..377935950 100644
--- a/cc-by-sa/knowledge/glossary/terms/grade_axis/content.md
+++ b/cc-by-sa/knowledge/glossary/terms/grade_axis/content.md
@@ -7,7 +7,9 @@ The [Google Fonts CSS v2 API ](https://developers.google.com/fonts/docs/css2) de
 | --- | --- | --- | --- |
 | 0 | -1000 | 1000 | 1 |
 
-Negative grade makes the style lighter, while positive grade makes it heavier. The units are the same as in the weight (`wght`) axis.
+Negative grade makes the style lighter, while positive grade makes it heavier.
+
+The units are the same as in the [weight (`wght`) axis](/glossary/weight_axis) and it’s important to use the two axes together, systematically. For example, where accessibility guidelines recommend using a Medium (500) weight for a button label to obtain a certain contrast level, using a Regular (400) weight with grade +100 (if the grade axis goes up to 100) will produce the same level of contrast—but without any reflow.
 
 <figure>