diff --git a/src/bucket.ts b/src/bucket.ts
index 465ef30fb..77ea35bd7 100644
--- a/src/bucket.ts
+++ b/src/bucket.ts
@@ -113,6 +113,7 @@ export interface EnableLoggingOptions {
 export interface GetFilesOptions {
   autoPaginate?: boolean;
   delimiter?: string;
+  /** @deprecated */
   directory?: string;
   endOffset?: string;
   includeTrailingDelimiter?: boolean;
@@ -2195,8 +2196,8 @@ class Bucket extends ServiceObject {
    *     names, aside from the prefix, contain delimiter will have their name
    *     truncated after the delimiter, returned in `apiResponse.prefixes`.
    *     Duplicate prefixes are omitted.
-   * @property {string} [directory] Filter results based on a directory name, or
-   *     more technically, a "prefix".
+   * @deprecated @property {string} [directory] Filter results based on a directory name, or
+   *     more technically, a "prefix". Assumes delimeter to be '/'. Deprecated. Use prefix instead.
    * @property {string} [endOffset] Filter results to objects whose names are
    * lexicographically before endOffset. If startOffset is also set, the objects
    * listed have names between startOffset (inclusive) and endOffset (exclusive).
@@ -2235,8 +2236,8 @@ class Bucket extends ServiceObject {
    *     names, aside from the prefix, contain delimiter will have their name
    *     truncated after the delimiter, returned in `apiResponse.prefixes`.
    *     Duplicate prefixes are omitted.
-   * @param {string} [query.directory] Filter results based on a directory name, or
-   *     more technically, a "prefix".
+   * @deprecated @param {string} [query.directory] Filter results based on a directory name, or
+   *     more technically, a "prefix". Assumes delimeter to be '/'. Deprecated. Use query.prefix instead.
    * @param {string} [query.endOffset] Filter results to objects whose names are
    * lexicographically before endOffset. If startOffset is also set, the objects
    * listed have names between startOffset (inclusive) and endOffset (exclusive).
diff --git a/system-test/storage.ts b/system-test/storage.ts
index ad0634f3d..2dfee34f3 100644
--- a/system-test/storage.ts
+++ b/system-test/storage.ts
@@ -3150,6 +3150,7 @@ describe('storage', () => {
     });
 
     it('should get files from a directory', done => {
+      //Note: Directory is deprecated.
       bucket.getFiles({directory: DIRECTORY_NAME}, (err, files) => {
         assert.ifError(err);
         assert.strictEqual(files!.length, 3);
@@ -3158,6 +3159,7 @@ describe('storage', () => {
     });
 
     it('should get files from a directory as a stream', done => {
+      //Note: Directory is deprecated.
       let numFilesEmitted = 0;
 
       bucket
diff --git a/test/bucket.ts b/test/bucket.ts
index fe30b4e92..d09d8fa43 100644
--- a/test/bucket.ts
+++ b/test/bucket.ts
@@ -1478,6 +1478,7 @@ describe('Bucket', () => {
     });
 
     it('should allow setting a directory', done => {
+      //Note: Directory is deprecated.
       const directory = 'directory-name';
       bucket.request = (reqOpts: DecorateRequestOptions) => {
         assert.strictEqual(reqOpts.qs.prefix, `${directory}/`);
@@ -1488,6 +1489,7 @@ describe('Bucket', () => {
     });
 
     it('should strip excess slashes from a directory', done => {
+      //Note: Directory is deprecated.
       const directory = 'directory-name///';
       bucket.request = (reqOpts: DecorateRequestOptions) => {
         assert.strictEqual(reqOpts.qs.prefix, 'directory-name/');