diff --git a/site/content/docs/5.1/utilities/flex.md b/site/content/docs/5.1/utilities/flex.md
index bbb1824b43f7..b9d359ab1dac 100644
--- a/site/content/docs/5.1/utilities/flex.md
+++ b/site/content/docs/5.1/utilities/flex.md
@@ -622,6 +622,7 @@ Responsive variations also exist for `align-content`.
 - `.align-content{{ .abbr }}-start`
 - `.align-content{{ .abbr }}-end`
 - `.align-content{{ .abbr }}-center`
+- `.align-content{{ .abbr }}-between`
 - `.align-content{{ .abbr }}-around`
 - `.align-content{{ .abbr }}-stretch`
 {{- end -}}