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-rw-r--r--nixos/doc/manual/development/option-types.xml2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixos/doc/manual/development/option-types.xml b/nixos/doc/manual/development/option-types.xml
index 8e6ac53ad48..741e763c295 100644
--- a/nixos/doc/manual/development/option-types.xml
+++ b/nixos/doc/manual/development/option-types.xml
@@ -282,7 +282,7 @@ config.mod.two = { foo = 2; bar = "two"; };</screen></example>
 <screen>
 byte = mkOption {
   description = "An integer between 0 and 255.";
-  type = addCheck (x: x &gt;= 0 &amp;&amp; x &lt;= 255) types.int;
+  type = addCheck types.int (x: x &gt;= 0 &amp;&amp; x &lt;= 255);
 };</screen></example>
 
 <example xml:id='ex-extending-type-check-2'><title>Overriding a type