diff --git a/core/src/main/java/com/google/common/truth/Truth.gwt.xml b/core/src/main/java/com/google/common/truth/Truth.gwt.xml
index 98e2232f2..b8ecd8d84 100644
--- a/core/src/main/java/com/google/common/truth/Truth.gwt.xml
+++ b/core/src/main/java/com/google/common/truth/Truth.gwt.xml
@@ -10,7 +10,9 @@
     util.concurrent tests under Guava.
 
     The problem is that GWT responds poorly to two .gwt.xml files in the same
-    Java package; see https://goo.gl/pRV3Yn for details.
+    Java package; see
+    https://groups.google.com/g/google-web-toolkit-contributors/c/CqYH59Dt_rQ/m/uVGW1QdUsXUJ
+    for details.
 
     The summary is that it ignores one file in favor of the other.
     util.concurrent, like nearly all our packages, has two .gwt.xml files: one