diff --git a/lib/util/periods.js b/lib/util/periods.js
index 67ef5f95e6..dd54ad0df1 100644
--- a/lib/util/periods.js
+++ b/lib/util/periods.js
@@ -24,6 +24,7 @@ goog.require('shaka.util.MimeUtils');
  *
  * @implements {shaka.util.IReleasable}
  * @final
+ * @export
  */
 shaka.util.PeriodCombiner = class {
   /** */
@@ -72,12 +73,20 @@ shaka.util.PeriodCombiner = class {
     this.variants_ = [];
   }
 
-  /** @return {!Array.<shaka.extern.Variant>} */
+  /**
+   * @return {!Array.<shaka.extern.Variant>}
+   *
+   * @export
+   */
   getVariants() {
     return this.variants_;
   }
 
-  /** @return {!Array.<shaka.extern.Stream>} */
+  /**
+   * @return {!Array.<shaka.extern.Stream>}
+   *
+   * @export
+  */
   getTextStreams() {
     // Return a copy of the array because makeTextStreamsForClosedCaptions
     // may make changes to the contents of the array. Those changes should not
@@ -85,7 +94,11 @@ shaka.util.PeriodCombiner = class {
     return this.textStreams_.slice();
   }
 
-  /** @return {!Array.<shaka.extern.Stream>} */
+  /**
+   * @return {!Array.<shaka.extern.Stream>}
+   *
+   * @export
+   */
   getImageStreams() {
     return this.imageStreams_;
   }
@@ -94,6 +107,8 @@ shaka.util.PeriodCombiner = class {
    * @param {!Array.<shaka.util.PeriodCombiner.Period>} periods
    * @param {boolean} isDynamic
    * @return {!Promise}
+   *
+   * @export
    */
   async combinePeriods(periods, isDynamic) {
     const ContentType = shaka.util.ManifestParserUtils.ContentType;
@@ -1638,6 +1653,8 @@ shaka.util.PeriodCombiner = class {
  *   The text streams from one Period.
  * @property {!Array.<shaka.extern.Stream>} imageStreams
  *   The image streams from one Period.
+ *
+ * @export
  */
 shaka.util.PeriodCombiner.Period;