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diff --git a/macros/generic/ifptex/README.md b/macros/generic/ifptex/README.md
index 4b09b0baff..9f09ad8d85 100644
--- a/macros/generic/ifptex/README.md
+++ b/macros/generic/ifptex/README.md
@@ -68,6 +68,16 @@ NB: Here “e-TeX-ness” is not considered.
Issues an error if `\ifnativeupTeX` fails.
* `\RequirepTeXng`
Issues an error if `\ifpTeXng` fails.
+ * `\upTeXguessedversion` [mathchardef-token]
+ The guessed value of upTeX version; given as a 100-folded integer.
+ NB. On version 1.23 or later, the value is correct.
+ NB. On a non-upTeX engine, the value is zero.
+ * `\RequireupTeXAtLeast{<required>}`
+ Issues an error if `\upTeXguessedversion` is smaller than the given
+ required value.
+ * `\RequireNativeupTeXAtLeast{<required>}`
+ Issues an error either if `\upTeXguessedversion` is smaller than
+ the given required value or if `\ifnativeupTeX` fails.
ifuptex Package ― Alias of ifptex
@@ -94,6 +104,9 @@ Just the same as the ifptex package.
Revision History
----------------
+ * Version 2.2 〈2022/04/03〉
+ - Officialy support `\upTeXguessedversion`.
+ - Add `\Require(Native)upTeXAtLeast`.
* Version 2.1 〈2021/07/01〉
- Adjust for the future version of pTeX.
- Drop an undocumented feature.