diff --git a/website/www/site/content/en/blog/beam-2.33.0.md b/website/www/site/content/en/blog/beam-2.33.0.md
index 8e7237591d1b..d2afd7a79bcd 100644
--- a/website/www/site/content/en/blog/beam-2.33.0.md
+++ b/website/www/site/content/en/blog/beam-2.33.0.md
@@ -79,6 +79,9 @@ notes](https://issues.apache.org/jira/secure/ReleaseNote.jspa?projectId=12319527
 * Spark 2.x users will need to update Spark's Jackson runtime dependencies (`spark.jackson.version`) to at least version 2.9.2, due to Beam updating its dependencies.
 * See a full list of open [issues that affect](https://issues.apache.org/jira/issues/?jql=project%20%3D%20BEAM%20AND%20affectedVersion%20%3D%202.33.0%20ORDER%20BY%20priority%20DESC%2C%20updated%20DESC) this version.
 * Go SDK jobs may produce "Failed to deduce Step from MonitoringInfo" messages following successful job execution. The messages are benign and don't indicate job failure. These are due to not yet handling PCollection metrics.
+* Large Java BigQueryIO writes with the FILE_LOADS method will fail in batch mode (specifically, when copy jobs are used).
+  This results in the error message: `IllegalArgumentException: Attempting to access unknown side input`.
+  Please upgrade to a newer version (> 2.34.0) or use another write method (e.g. `STORAGE_WRITE_API`).
 
 ## List of Contributors
 
diff --git a/website/www/site/content/en/blog/beam-2.34.0.md b/website/www/site/content/en/blog/beam-2.34.0.md
index 2f335a86fd83..288496aaa809 100644
--- a/website/www/site/content/en/blog/beam-2.34.0.md
+++ b/website/www/site/content/en/blog/beam-2.34.0.md
@@ -61,6 +61,12 @@ notes](https://issues.apache.org/jira/secure/ReleaseNote.jspa?projectId=12319527
 * Fixed error when importing the DataFrame API with pandas 1.0.x installed ([BEAM-12945](https://issues.apache.org/jira/browse/BEAM-12945)).
 * Fixed top.SmallestPerKey implementation in the Go SDK ([BEAM-12946](https://issues.apache.org/jira/browse/BEAM-12946)).
 
+### Known Issues
+
+* Large Java BigQueryIO writes with the FILE_LOADS method will fail in batch mode (specifically, when copy jobs are used).
+  This results in the error message: `IllegalArgumentException: Attempting to access unknown side input`.
+  Please upgrade to a newer version (> 2.34.0) or use another write method (e.g. `STORAGE_WRITE_API`).
+
 ## List of Contributors
 
 According to git shortlog, the following people contributed to the 2.34.0 release. Thank you to all contributors!