diff --git a/osi_featuredata.proto b/osi_featuredata.proto
index 402869366..d1e784236 100644
--- a/osi_featuredata.proto
+++ b/osi_featuredata.proto
@@ -916,6 +916,8 @@ message CameraDetection
     //
     enum Color
     {
+        option allow_alias = true;
+
         // Color of the shape is unknown (must not be used in ground
         // truth).
         //
@@ -931,6 +933,7 @@ message CameraDetection
 
         // Shape with gray color.
         //
+        COLOR_GRAY = 3;
         COLOR_GREY = 3;
 
         // Shape with white color.
diff --git a/osi_object.proto b/osi_object.proto
index cf59d6bc7..d759531ae 100644
--- a/osi_object.proto
+++ b/osi_object.proto
@@ -223,6 +223,8 @@ message StationaryObject
         //
         enum Material
         {
+            option allow_alias = true;
+
             // Type of the material is unknown (must not be used in ground
             // truth).
             //
@@ -254,6 +256,7 @@ message StationaryObject
 
             // Glass structure.
             //
+            MATERIAL_GLASS = 7;
             MATERIAL_GLAS = 7;
 
             // Mud structure.
@@ -303,6 +306,8 @@ message StationaryObject
         //
         enum Color
         {
+            option allow_alias = true;
+
             // Color is unknown (must not be used in ground truth).
             //
             COLOR_UNKNOWN = 0;
@@ -339,8 +344,9 @@ message StationaryObject
             //
             COLOR_BLACK = 8;
 
-            // GREY.
+            // GRAY.
             //
+            COLOR_GRAY = 9;
             COLOR_GREY = 9;
 
             // White.