diff --git a/WORKSPACE b/WORKSPACE
index 3941b52..cc8a943 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -54,9 +54,8 @@ http_archive(
     sha256 = "bbccf674aa441c266df9894182d80de104cabd19be98be002f6d478aaa31574d",
     strip_prefix = "bazel-skylib-2169ae1c374aab4a09aa90e65efe1a3aad4e279b",
     urls = [
-        # TODO(jart): add to bazel mirror.
-        # "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/archive/2169ae1c374aab4a09aa90e65efe1a3aad4e279b.tar.gz",
-        "https://github.com/bazelbuild/bazel-skylib/archive/2169ae1c374aab4a09aa90e65efe1a3aad4e279b.tar.gz", # 2018-01-12
+        "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/archive/2169ae1c374aab4a09aa90e65efe1a3aad4e279b.tar.gz",
+        "https://github.com/bazelbuild/bazel-skylib/archive/2169ae1c374aab4a09aa90e65efe1a3aad4e279b.tar.gz",  # 2018-01-12
     ],
 )
 
@@ -72,8 +71,7 @@ http_archive(
     sha256 = "a1264301424f2d920fca04f2d3c5ef5ca1be4f2bbf8c84ef38006e54aaf22753",
     strip_prefix = "rules_webtesting-9f597bb7d1b40a63dc443d9ef7e931cfad4fb098",
     urls = [
-        # TODO(jart): add to bazel mirror.
-        # "https://mirror.bazel.build/github.com/bazelbuild/rules_webtesting/archive/9f597bb7d1b40a63dc443d9ef7e931cfad4fb098.tar.gz",  # 2017-01-29
+        "https://mirror.bazel.build/github.com/bazelbuild/rules_webtesting/archive/9f597bb7d1b40a63dc443d9ef7e931cfad4fb098.tar.gz",  # 2017-01-29
         "https://github.com/bazelbuild/rules_webtesting/archive/9f597bb7d1b40a63dc443d9ef7e931cfad4fb098.tar.gz",
     ],
 )
@@ -106,7 +104,6 @@ http_archive(
     sha256 = "087242325ef3b91f1909e3fd3a873ad15e3c7703990ad8caab64736d9009bf62",
     strip_prefix = "tensorboard-1.6.0",
     urls = [
-        # TODO(jart): Add a bazel mirror.
         "http://mirror.bazel.build/github.com/tensorflow/tensorboard/archive/1.6.0.tar.gz",
         "https://github.com/tensorflow/tensorboard/archive/1.6.0.tar.gz",
     ],