diff --git a/pvlib/iotools/__init__.py b/pvlib/iotools/__init__.py
index c4d864f0a9..a43f929719 100644
--- a/pvlib/iotools/__init__.py
+++ b/pvlib/iotools/__init__.py
@@ -11,6 +11,9 @@
 from pvlib.iotools.psm3 import get_psm3  # noqa: F401
 from pvlib.iotools.psm3 import read_psm3  # noqa: F401
 from pvlib.iotools.psm3 import parse_psm3  # noqa: F401
+from pvlib.iotools.psm4 import get_psm4  # noqa: F401
+from pvlib.iotools.psm4 import read_psm4  # noqa: F401
+from pvlib.iotools.psm4 import parse_psm4  # noqa: F401
 from pvlib.iotools.pvgis import get_pvgis_tmy, read_pvgis_tmy  # noqa: F401
 from pvlib.iotools.pvgis import read_pvgis_hourly  # noqa: F401
 from pvlib.iotools.pvgis import get_pvgis_hourly  # noqa: F401
@@ -34,6 +37,3 @@
 from pvlib.iotools.solcast import get_solcast_historic  # noqa: F401
 from pvlib.iotools.solcast import get_solcast_tmy  # noqa: F401
 from pvlib.iotools.solargis import get_solargis  # noqa: F401
-from pvlib.iotools.goes4 import get_goes4  # noqa: F401
-from pvlib.iotools.goes4 import read_goes4  # noqa: F401
-from pvlib.iotools.goes4 import parse_goes4  # noqa: F401
diff --git a/pvlib/iotools/psm4.py b/pvlib/iotools/psm4.py
index 9bce27b848..f1a5eba7e3 100644
--- a/pvlib/iotools/psm4.py
+++ b/pvlib/iotools/psm4.py
@@ -5,18 +5,18 @@
 """
 
 import io
+from urllib.parse import urljoin
 import requests
 import pandas as pd
 from json import JSONDecodeError
 
-NSRDB_API_BASE = "https://developer.nrel.gov"
-API_STUB = "/api/nsrdb/v2/solar/"
+NSRDB_API_BASE = "https://developer.nrel.gov/api/nsrdb/v2/solar/"
 GOES_ENDPOINT = "nsrdb-GOES-aggregated-v4-0-0-download.csv"
 TMY_ENDPOINT = "nsrdb-GOES-tmy-v4-0-0-download.csv"
 GOESCONUS_ENDPOINT = "nsrdb-GOES-conus-v4-0-0-download.csv"
-GOES_URL = NSRDB_API_BASE + API_STUB + GOES_ENDPOINT
-TMY_URL = NSRDB_API_BASE + API_STUB + TMY_ENDPOINT
-GOESCONUS_URL = NSRDB_API_BASE + API_STUB + GOESCONUS_ENDPOINT
+GOES_URL = urljoin(NSRDB_API_BASE, GOES_ENDPOINT)
+TMY_URL = urljoin(NSRDB_API_BASE, TMY_ENDPOINT)
+GOESCONUS_URL = urljoin(NSRDB_API_BASE, GOESCONUS_ENDPOINT)
 
 ATTRIBUTES = (
     'air_temperature', 'dew_point', 'dhi', 'dni', 'ghi', 'surface_albedo',
@@ -356,11 +356,6 @@ def read_psm4(filename, map_variables=True):
     Read an NSRDB PSM4 weather file (formatted as SAM CSV). The NSRDB
     is described in [1]_ and the SAM CSV format is described in [2]_.
 
-    .. versionchanged:: 0.9.0
-       The function now returns a tuple where the first element is a dataframe
-       and the second element is a dictionary containing metadata. Previous
-       versions of this function had the return values switched.
-
     Parameters
     ----------
     filename: str
diff --git a/pvlib/tests/iotools/test_psm4.py b/pvlib/tests/iotools/test_psm4.py
index a525e88d46..d6464451c8 100644
--- a/pvlib/tests/iotools/test_psm4.py
+++ b/pvlib/tests/iotools/test_psm4.py
@@ -185,7 +185,7 @@ def test_get_psm4_attribute_mapping(nrel_api_key):
     """Test that pvlib names can be passed in as attributes and get correctly
     reverse mapped to psm4 names"""
     data, meta = psm4.get_psm4(LATITUDE, LONGITUDE, nrel_api_key,
-                               PVLIB_EMAIL, names=2019, interval=60,
+                               PVLIB_EMAIL, names='2019', interval=60,
                                attributes=['ghi', 'wind_speed'],
                                leap_day=False, map_variables=True)
     # Check that columns are in the correct order (GH1647)