diff --git a/app/src/main/java/com/example/research/core/domain/model/DictionarySource.kt b/app/src/main/java/com/example/research/core/domain/model/DictionarySource.kt
index 7df0ce1..a48d9da 100644
--- a/app/src/main/java/com/example/research/core/domain/model/DictionarySource.kt
+++ b/app/src/main/java/com/example/research/core/domain/model/DictionarySource.kt
@@ -102,12 +102,15 @@ data class DictionarySource(
 
         fun validateTemplate(template: String): ValidationResult {
             val trimmed = template.trim()
+            val lowerTemplate = trimmed.lowercase()
             return when {
                 trimmed.isBlank() -> ValidationResult.Error(ValidationError.EMPTY)
                 trimmed.length > 2048 -> ValidationResult.Error(ValidationError.TOO_LONG)
                 !trimmed.startsWith("http://") && !trimmed.startsWith("https://") ->
                     ValidationResult.Error(ValidationError.INVALID_PROTOCOL)
-                !trimmed.endsWith(".gz") && !trimmed.endsWith(".dsl") && !trimmed.endsWith(".dz") ->
+                !lowerTemplate.endsWith(".gz") &&
+                    !lowerTemplate.endsWith(".dsl") &&
+                    !lowerTemplate.endsWith(".dsl.dz") ->
                     ValidationResult.Error(ValidationError.INVALID_EXTENSION)
                 !isValidUrlStructure(trimmed) ->
                     ValidationResult.Error(ValidationError.INVALID_URL_STRUCTURE)
diff --git a/app/src/main/res/values-ru/strings.xml b/app/src/main/res/values-ru/strings.xml
index 7ab2cce..bd511f0 100644
--- a/app/src/main/res/values-ru/strings.xml
+++ b/app/src/main/res/values-ru/strings.xml
@@ -76,7 +76,7 @@
     <string name="dictionary_source_duplicate_prefix">Этот словарь уже существует (одинаковый префикс)</string>
     <string name="dictionary_source_url_empty">URL не может быть пустым</string>
     <string name="dictionary_source_invalid_protocol">Должен начинаться с http:// или https://</string>
-    <string name="dictionary_source_invalid_extension">Должен заканчиваться на .gz, .dsl или .dz</string>
+    <string name="dictionary_source_invalid_extension">Должен заканчиваться на .gz, .dsl или .dsl.dz</string>
     <string name="dictionary_source_too_long">URL слишком длинный (максимум 2048 символов)</string>
     <string name="dictionary_source_invalid_url">Неверный формат URL</string>
     <string name="dictionary_source_suspicious_characters">URL содержит недопустимые символы</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 5fd1ba5..2a03b5a 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -74,7 +74,7 @@
     <string name="dictionary_source_duplicate_prefix">This dictionary already exists</string>
     <string name="dictionary_source_url_empty">URL cannot be empty</string>
     <string name="dictionary_source_invalid_protocol">Must start with http:// or https://</string>
-    <string name="dictionary_source_invalid_extension">Must end with .gz, .dsl, or .dz</string>
+    <string name="dictionary_source_invalid_extension">Must end with .gz, .dsl, or .dsl.dz</string>
     <string name="dictionary_source_too_long">URL is too long (max 2048 characters)</string>
     <string name="dictionary_source_invalid_url">Invalid URL format</string>
     <string name="dictionary_source_suspicious_characters">URL contains invalid characters</string>