diff --git a/java/res/values/attrs.xml b/java/res/values/attrs.xml
index 5824d17..70fc7f8 100644
--- a/java/res/values/attrs.xml
+++ b/java/res/values/attrs.xml
@@ -242,6 +242,9 @@
             <flag name="withIconLeft" value="0x1000" />
             <flag name="withIconRight" value="0x2000" />
             <flag name="autoXScale" value="0x4000" />
+            <!-- If true, character case of code, altCode, moreKeys, keyOutputText, keyLabel,
+                 or keyHintLabel will never be subject to change. -->
+            <flag name="preserveCase" value="0x8000" />
         </attr>
         <!-- The icon to display on the key instead of the label. -->
         <attr name="keyIcon" format="enum">