diff --git a/src/future/http/BaseHTTPFuture.php b/src/future/http/BaseHTTPFuture.php
--- a/src/future/http/BaseHTTPFuture.php
+++ b/src/future/http/BaseHTTPFuture.php
@@ -317,7 +317,7 @@
    * Parse a raw HTTP response into a <status, body, headers> tuple.
    *
    * @param string $raw_response Raw HTTP response.
-   * @return tuple Valid resolution tuple.
+   * @return array Valid resolution tuple.
    * @task internal
    */
   protected function parseRawHTTPResponse($raw_response) {
@@ -444,7 +444,7 @@
    * Build a result tuple indicating a parse error resulting from a malformed
    * HTTP response.
    *
-   * @return tuple Valid resolution tuple.
+   * @return array Valid resolution tuple.
    * @task internal
    */
   protected function buildMalformedResult($raw_response) {
diff --git a/src/hgdaemon/ArcanistHgProxyClient.php b/src/hgdaemon/ArcanistHgProxyClient.php
--- a/src/hgdaemon/ArcanistHgProxyClient.php
+++ b/src/hgdaemon/ArcanistHgProxyClient.php
@@ -75,7 +75,7 @@
    *
    * @param list<string> $argv A list of command arguments, like "log", "-l",
    *   "5".
-   * @return tuple<int, string, string> Return code, stdout and stderr.
+   * @return array<int, string, string> Tuple of return code, stdout, stderr.
    *
    * @task exec
    */