diff --git a/tools/aapt2/Configuration.proto b/tools/aapt2/Configuration.proto
index 8a4644c..4883844 100644
--- a/tools/aapt2/Configuration.proto
+++ b/tools/aapt2/Configuration.proto
@@ -120,6 +120,13 @@
     NAVIGATION_WHEEL = 4;
   }
 
+  enum GrammaticalGender {
+    GRAM_GENDER_USET = 0;
+    GRAM_GENDER_NEUTER = 1;
+    GRAM_GENDER_FEMININE = 2;
+    GRAM_GENDER_MASCULINE = 3;
+  }
+
   //
   // Axis/dimensions that are understood by the runtime.
   //
@@ -198,6 +205,9 @@
   // The minimum SDK version of the device.
   uint32 sdk_version = 24;
 
+  // Grammatical gender.
+  GrammaticalGender grammatical_gender = 26;
+
   //
   // Build-time only dimensions.
   //