diff --git a/app/src/main/java/org/dslul/openboard/inputmethod/latin/utils/ScriptUtils.java b/app/src/main/java/org/dslul/openboard/inputmethod/latin/utils/ScriptUtils.java
index 91cb1a1d..f5ae867b 100644
--- a/app/src/main/java/org/dslul/openboard/inputmethod/latin/utils/ScriptUtils.java
+++ b/app/src/main/java/org/dslul/openboard/inputmethod/latin/utils/ScriptUtils.java
@@ -30,6 +30,7 @@ public class ScriptUtils {
     // Used for hardware keyboards
     public static final int SCRIPT_UNKNOWN = -1;
 
+    // These should be aligned with KeyboardLayoutSet_Feature values in attrs.xml.
     public static final int SCRIPT_ARABIC = 0;
     public static final int SCRIPT_ARMENIAN = 1;
     public static final int SCRIPT_BENGALI = 2;
diff --git a/app/src/main/res/values/attrs.xml b/app/src/main/res/values/attrs.xml
index 9dc22acd..f36e213e 100644
--- a/app/src/main/res/values/attrs.xml
+++ b/app/src/main/res/values/attrs.xml
@@ -609,6 +609,7 @@
             <enum name="tamil" value="15" />
             <enum name="telugu" value="16" />
             <enum name="thai" value="17" />
+            <enum name="bulgarian" value="18" />
         </attr>
     </declare-styleable>