diff --git a/packages/config/lib/index.d.ts b/packages/config/lib/index.d.ts
index 302eac3c..770dd828 100644
--- a/packages/config/lib/index.d.ts
+++ b/packages/config/lib/index.d.ts
@@ -219,9 +219,9 @@ export namespace Config {
      * await firebase.config().fetch(300);
      * ```
      *
-     * @param cacheExpirationSeconds Duration in seconds to cache the data for. To skip cache, use a duration of 0.
+     * @param expirationDurationSeconds Duration in seconds to cache the data for. To skip cache, use a duration of 0.
      */
-    fetch(cacheExpirationSeconds?: number): Promise<null>;
+    fetch(expirationDurationSeconds?: number): Promise<null>;
 
     /**
      * Fetches the remote config data from Firebase, as defined in the dashboard. If duration is defined (seconds), data will be locally cached for this duration.
@@ -241,9 +241,9 @@ export namespace Config {
      * }
      * ```
      *
-     * @param cacheExpirationSeconds Duration in seconds to cache the data for. To skip cache use a duration of 0.
+     * @param expirationDurationSeconds Duration in seconds to cache the data for. To skip cache use a duration of 0.
      */
-    fetchAndActivate(cacheExpirationSeconds?: number): Promise<boolean>;
+    fetchAndActivate(expirationDurationSeconds?: number): Promise<boolean>;
 
     /**
      * Retrieve the configuration settings and status for Remote Config.
diff --git a/packages/config/lib/index.js b/packages/config/lib/index.js
index 33479ced..b816420c 100644
--- a/packages/config/lib/index.js
+++ b/packages/config/lib/index.js
@@ -92,36 +92,36 @@ class FirebaseConfigModule extends FirebaseModule {
   /**
    * Fetches parameter values for your app.
 
-   * @param {number} cacheExpirationSeconds
+   * @param {number} expirationDurationSeconds
    * @returns {Promise}
    */
-  fetch(cacheExpirationSeconds) {
-    if (!isUndefined(cacheExpirationSeconds) && !isNumber(cacheExpirationSeconds)) {
+  fetch(expirationDurationSeconds) {
+    if (!isUndefined(expirationDurationSeconds) && !isNumber(expirationDurationSeconds)) {
       throw new Error(
-        `firebase.config().fetch(): 'cacheExpirationSeconds' must be a number value.`,
+        `firebase.config().fetch(): 'expirationDurationSeconds' must be a number value.`,
       );
     }
 
     return this.native.fetch(
-      cacheExpirationSeconds !== undefined ? cacheExpirationSeconds : -1,
+      expirationDurationSeconds !== undefined ? expirationDurationSeconds : -1,
       false,
     );
   }
 
   /**
    * TODO(salakar) return boolean always?
-   * @param cacheExpirationSeconds
+   * @param expirationDurationSeconds
    * @returns {Promise|never|Promise<Response>}
    */
-  fetchAndActivate(cacheExpirationSeconds) {
-    if (!isUndefined(cacheExpirationSeconds) && !isNumber(cacheExpirationSeconds)) {
+  fetchAndActivate(expirationDurationSeconds) {
+    if (!isUndefined(expirationDurationSeconds) && !isNumber(expirationDurationSeconds)) {
       throw new Error(
-        `firebase.config().fetchAndActivate(): 'cacheExpirationSeconds' must be a number value.`,
+        `firebase.config().fetchAndActivate(): 'expirationDurationSeconds' must be a number value.`,
       );
     }
 
     return this.native.fetch(
-      cacheExpirationSeconds !== undefined ? cacheExpirationSeconds : -1,
+      expirationDurationSeconds !== undefined ? expirationDurationSeconds : -1,
       true,
     );
   }
diff --git a/packages/config/lib/index.js.flow b/packages/config/lib/index.js.flow
index 37fa1be0..d362884d 100644
--- a/packages/config/lib/index.js.flow
+++ b/packages/config/lib/index.js.flow
@@ -166,9 +166,9 @@ export interface Module extends ReactNativeFirebaseModule {
    * await firebase.config().fetch(300);
    * ```
    *
-   * @param cacheExpirationSeconds Duration in seconds to cache the data for. To skip cache, use a duration of 0.
+   * @param expirationDurationSeconds Duration in seconds to cache the data for. To skip cache, use a duration of 0.
    */
-  fetch(cacheExpirationSeconds?: number): Promise<null>;
+  fetch(expirationDurationSeconds?: number): Promise<null>;
 
   /**
    * Fetches the remote config data from Firebase, as defined in the dashboard. If duration is defined (seconds), data will be locally cached for this duration.
@@ -188,9 +188,9 @@ export interface Module extends ReactNativeFirebaseModule {
    * }
    * ```
    *
-   * @param cacheExpirationSeconds Duration in seconds to cache the data for. To skip cache use a duration of 0.
+   * @param expirationDurationSeconds Duration in seconds to cache the data for. To skip cache use a duration of 0.
    */
-  fetchAndActivate(cacheExpirationSeconds?: number): Promise<boolean>;
+  fetchAndActivate(expirationDurationSeconds?: number): Promise<boolean>;
 
   /**
    * Retrieve the configuration settings and status for Remote Config.