diff --git a/packages/firestore/src/protos/firestore_proto_api.d.ts b/packages/firestore/src/protos/firestore_proto_api.d.ts
index 19f5e1dfbbe..ab9df59a018 100644
--- a/packages/firestore/src/protos/firestore_proto_api.d.ts
+++ b/packages/firestore/src/protos/firestore_proto_api.d.ts
@@ -16,10 +16,10 @@
  */
 
 // Rather than pull these in from other protos, we just alias them to any.
-/* 
+/*
    eslint-disable
-   camelcase, @typescript-eslint/no-explicit-any, 
-   @typescript-eslint/interface-name-prefix,  @typescript-eslint/class-name-casing 
+   camelcase, @typescript-eslint/no-explicit-any,
+   @typescript-eslint/interface-name-prefix,  @typescript-eslint/class-name-casing
 */
 export declare type ApiClientHookFactory = any;
 export declare type PromiseRequestService = any;
@@ -44,9 +44,11 @@ export declare type FieldFilterOp =
   | 'GREATER_THAN'
   | 'GREATER_THAN_OR_EQUAL'
   | 'EQUAL'
+  | 'NOT_EQUAL'
   | 'ARRAY_CONTAINS'
   | 'IN'
-  | 'ARRAY_CONTAINS_ANY';
+  | 'ARRAY_CONTAINS_ANY'
+  | 'NOT_IN';
 export interface IFieldFilterOpEnum {
   OPERATOR_UNSPECIFIED: FieldFilterOp;
   LESS_THAN: FieldFilterOp;
@@ -54,9 +56,11 @@ export interface IFieldFilterOpEnum {
   GREATER_THAN: FieldFilterOp;
   GREATER_THAN_OR_EQUAL: FieldFilterOp;
   EQUAL: FieldFilterOp;
+  NOT_EQUAL: FieldFilterOp;
   ARRAY_CONTAINS: FieldFilterOp;
   IN: FieldFilterOp;
   ARRAY_CONTAINS_ANY: FieldFilterOp;
+  NOT_IN: FieldFilterOp;
   values(): FieldFilterOp[];
 }
 export declare const FieldFilterOpEnum: IFieldFilterOpEnum;
diff --git a/packages/firestore/src/protos/google/firestore/v1/query.proto b/packages/firestore/src/protos/google/firestore/v1/query.proto
index de695e6289b..a85010f4305 100644
--- a/packages/firestore/src/protos/google/firestore/v1/query.proto
+++ b/packages/firestore/src/protos/google/firestore/v1/query.proto
@@ -85,32 +85,74 @@ message StructuredQuery {
       // Unspecified. This value must not be used.
       OPERATOR_UNSPECIFIED = 0;
 
-      // Less than. Requires that the field come first in `order_by`.
+      // The given `field` is less than the given `value`.
+      //
+      // Requires:
+      //
+      // * That `field` come first in `order_by`.
       LESS_THAN = 1;
 
-      // Less than or equal. Requires that the field come first in `order_by`.
+      // The given `field` is less than or equal to the given `value`.
+      //
+      // Requires:
+      //
+      // * That `field` come first in `order_by`.
       LESS_THAN_OR_EQUAL = 2;
 
-      // Greater than. Requires that the field come first in `order_by`.
+      // The given `field` is greater than the given `value`.
+      //
+      // Requires:
+      //
+      // * That `field` come first in `order_by`.
       GREATER_THAN = 3;
 
-      // Greater than or equal. Requires that the field come first in
-      // `order_by`.
+      // The given `field` is greater than or equal to the given `value`.
+      //
+      // Requires:
+      //
+      // * That `field` come first in `order_by`.
       GREATER_THAN_OR_EQUAL = 4;
 
-      // Equal.
+      // The given `field` is equal to the given `value`..
       EQUAL = 5;
 
-      // Contains. Requires that the field is an array.
+      // The given `field` is not equal to the given `value`.
+      //
+      // Requires:
+      //
+      // * No other `NOT_EQUAL`, `NOT_IN`, `IS_NOT_NULL`, or `IS_NOT_NAN`.
+      // * That `field` comes first in the `order_by`.
+      NOT_EQUAL = 6;
+
+      // The given `field` is an array that contains the given `value`.
       ARRAY_CONTAINS = 7;
 
-      // In. Requires that `value` is a non-empty ArrayValue with at most 10
-      // values.
+      // The given `field` is equal to at least one value in the given array.
+      //
+      // Requires:
+      //
+      // * That `value` is a non-empty `ArrayValue` with at most 10 values.
+      // * No other `IN` or `ARRAY_CONTAINS_ANY`. (-- or `NOT_IN` --)
       IN = 8;
 
-      // Contains any. Requires that the field is an array and
-      // `value` is a non-empty ArrayValue with at most 10 values.
+      // The given `field` is an array that contains any of the values in the
+      // given array.
+      //
+      // Requires:
+      //
+      // * That `value` is a non-empty `ArrayValue` with at most 10 values.
+      // * No other `IN` or `ARRAY_CONTAINS_ANY`. (-- or `NOT_IN` --)
       ARRAY_CONTAINS_ANY = 9;
+
+      // The value of the `field` is not in the given array.
+      //
+      // Requires:
+      //
+      // * That `value` is a non-empty `ArrayValue` with at most 10 values.
+      // * No other `IN`, `ARRAY_CONTAINS_ANY`, `NOT_IN`, `NOT_EQUAL`,
+      //   `IS_NOT_NULL`, or `IS_NOT_NAN`.
+      // * That `field` comes first in the `order_by`.
+      NOT_IN = 10;
     }
 
     // The field to filter by.