diff --git a/pvlib/snow.py b/pvlib/snow.py
index 3d0fc5a94..0bc122ac1 100644
--- a/pvlib/snow.py
+++ b/pvlib/snow.py
@@ -292,8 +292,9 @@ def loss_townsend(snow_total, snow_events, surface_tilt, relative_humidity,
         Workshop (PVRW) 2023 Proceedings: Posters.", ed. Silverman,
         T. J. Dec. 2023. NREL/CP-5900-87918.
         Available at: https://www.nrel.gov/docs/fy25osti/90585.pdf
-    .. [3] Townsend, T. (2025). Snow Events Definition.
-       :doi:`10.13140/RG.2.2.14299.68647`
+    .. [3] Townsend, T. (2013). Predicting PV Energy Loss Caused by Snow.
+        Solar Power International, Chicago IL.
+        doi:`10.13140/RG.2.2.14299.68647`
     '''
 
     # unit conversions from cm and m to in, from C to K, and from % to fraction