diff --git a/languagetool-language-modules/pt/src/main/resources/org/languagetool/rules/pt/style.xml b/languagetool-language-modules/pt/src/main/resources/org/languagetool/rules/pt/style.xml
index 333068c526eb..0b00ced4c48c 100644
--- a/languagetool-language-modules/pt/src/main/resources/org/languagetool/rules/pt/style.xml
+++ b/languagetool-language-modules/pt/src/main/resources/org/languagetool/rules/pt/style.xml
@@ -19394,5 +19394,13 @@ USA
             <url>https://pt.wikipedia.org/wiki/Kelvin</url>
             <example correction="kelvins">O sol tem a temperatura de 15,7 milhões de <marker>graus kelvin</marker>.</example>
         </rule>
+
+        <rule id="OK_EM_MINUSCULA" name="Preferência por 'OK' em vez de 'ok'" tags="picky">
+            <pattern>
+                <token case_sensitive="yes">ok</token>
+            </pattern>
+            <message>Prefira <suggestion>OK</suggestion>.</message>
+            <example correction="OK">Está tudo <marker>ok</marker> com ela?</example>
+        </rule>
     </category>
 </rules>