diff --git a/.kokoro/build.sh b/.kokoro/build.sh
index 0e71e2aca..cb81a05f8 100755
--- a/.kokoro/build.sh
+++ b/.kokoro/build.sh
@@ -15,7 +15,11 @@
 
 set -eo pipefail
 
-cd github/python-bigquery
+if [[ -z "${PROJECT_ROOT:-}" ]]; then
+    PROJECT_ROOT="github/python-bigquery"
+fi
+
+cd "${PROJECT_ROOT}"
 
 # Disable buffering, so that the logs stream through.
 export PYTHONUNBUFFERED=1
diff --git a/.kokoro/docs/docs-presubmit.cfg b/.kokoro/docs/docs-presubmit.cfg
index 111810782..5c216b4bc 100644
--- a/.kokoro/docs/docs-presubmit.cfg
+++ b/.kokoro/docs/docs-presubmit.cfg
@@ -15,3 +15,14 @@ env_vars: {
     key: "TRAMPOLINE_IMAGE_UPLOAD"
     value: "false"
 }
+
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/python-bigquery/.kokoro/build.sh"
+}
+
+# Only run this nox session.
+env_vars: {
+    key: "NOX_SESSION"
+    value: "docs docfx"
+}
\ No newline at end of file
diff --git a/noxfile.py b/noxfile.py
index 441782583..95818d3c8 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -25,6 +25,18 @@
 BLACK_PATHS = ("docs", "google", "samples", "tests", "noxfile.py", "setup.py")
 CURRENT_DIRECTORY = pathlib.Path(__file__).parent.absolute()
 
+# 'docfx' is excluded since it only needs to run in 'docs-presubmit'
+nox.options.sessions = [
+    "unit",
+    "system",
+    "snippets",
+    "cover",
+    "lint",
+    "lint_setup_py",
+    "blacken",
+    "docs",
+]
+
 
 def default(session):
     """Default unit test session.