diff --git a/rest-api-spec/src/main/resources/rest-api-spec/api/cat.indices.json b/rest-api-spec/src/main/resources/rest-api-spec/api/cat.indices.json
index 60a98412c31..68194bc652b 100644
--- a/rest-api-spec/src/main/resources/rest-api-spec/api/cat.indices.json
+++ b/rest-api-spec/src/main/resources/rest-api-spec/api/cat.indices.json
@@ -38,8 +38,15 @@
         "options":[
           "b",
           "k",
+          "kb",
           "m",
-          "g"
+          "mb",
+          "g",
+          "gb",
+          "t",
+          "tb",
+          "p",
+          "pb"
         ]
       },
       "local":{