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diff --git a/doc/pacman.8.txt b/doc/pacman.8.txt
index 5594ac61..08764dea 100644
--- a/doc/pacman.8.txt
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@@ -61,7 +61,13 @@ provide the same functionality as foo will be searched for. If any package is
found, it will be installed.
+
You can also use `pacman -Su` to upgrade all packages that are out of date. See
-<<SO,Sync Options>> below.
+<<SO,Sync Options>> below. When upgrading, pacman performs version comparison
+to determine which packages need upgrading. This behavior operates as follows:
+
+ Alphanumeric:
+ 1.0 < 1.0a < 1.0alpha < 1.0b < 1.0beta < 1.0p < 1.0pre < 1.0rc
+ Numeric:
+ 1 < 1.0 < 1.1 < 1.1.1 < 1.2 < 2.0 < 3.0.0
*-U, \--upgrade*::
Upgrade or add a package to the system. Either a URL or file path can be