diff --git a/commonItems.UnitTests/Linguistics/StringExtensionsTests.cs b/commonItems.UnitTests/Linguistics/StringExtensionsTests.cs
index 2056146a..727f0b6a 100644
--- a/commonItems.UnitTests/Linguistics/StringExtensionsTests.cs
+++ b/commonItems.UnitTests/Linguistics/StringExtensionsTests.cs
@@ -187,6 +187,7 @@ public class StringExtensionsTests {
 	[InlineData("Trelew", "Trelewense")]
 	[InlineData("Nanaimo", "Nanaimoite")]
 	[InlineData("Envigado", "Envigadeño")]
+	[InlineData("Chigorodó", "Chigorodoseño")]
 	
 	// adjectives relying on rewrite rules
 	[InlineData("Armenia Maioris", "Greater Armenian")]
diff --git a/commonItems/Linguistics/adjective_rules.txt b/commonItems/Linguistics/adjective_rules.txt
index ba4f5009..61dadfa7 100644
--- a/commonItems/Linguistics/adjective_rules.txt
+++ b/commonItems/Linguistics/adjective_rules.txt
@@ -550,6 +550,7 @@
 {"*ce", "*cian"}, // Thrace
 {"*co", "*can"}, // Morocco
 {"*de", "*dean"}, // Cape Verde
+{"*dó", "*doseño"}, // Chigorodó
 {"*du", "*dunite"}, // Ordu
 {"*eh", "*ehi"},
 {"*ej", "*ejite"},