diff --git a/README.md b/README.md
index aff95df508..8c3156362a 100644
--- a/README.md
+++ b/README.md
@@ -81,7 +81,7 @@ benefits of Comet's acceleration capabilities without disrupting your Spark appl
 
 ## Getting Started
 
-Comet supports Apache Spark 3.4 and 3.5, and provides experimental support for Spark 4.0. See the
+Comet supports Apache Spark 3.4, 3.5, and 4.0. See the
 [installation guide](https://datafusion.apache.org/comet/user-guide/installation.html) for the detailed
 version, Java, and Scala compatibility matrix.
 
diff --git a/docs/source/contributor-guide/roadmap.md b/docs/source/contributor-guide/roadmap.md
index c685e0fb80..46f6671a74 100644
--- a/docs/source/contributor-guide/roadmap.md
+++ b/docs/source/contributor-guide/roadmap.md
@@ -34,8 +34,8 @@ encryption) to the reader.
 
 ### Spark 4.0 Support
 
-Comet has experimental support for Spark 4.0, but there is more work to do ([#1637]), such as enabling
-more Spark SQL tests and fully implementing ANSI support ([#313]) for all supported expressions.
+Comet fully supports Spark 4.0. There is ongoing work to fully implement ANSI support ([#313]) for all
+supported expressions and to address remaining [Spark 4.0-specific limitations](../../user-guide/latest/compatibility.md#spark-40-limitations).
 
 [#313]: https://github.com/apache/datafusion-comet/issues/313
 [#1637]: https://github.com/apache/datafusion-comet/issues/1637
diff --git a/docs/source/user-guide/latest/compatibility.md b/docs/source/user-guide/latest/compatibility.md
index 1b66345210..e8f209bc1b 100644
--- a/docs/source/user-guide/latest/compatibility.md
+++ b/docs/source/user-guide/latest/compatibility.md
@@ -125,6 +125,23 @@ achieves the same semantic goals:
 The only difference is that Comet's partition assignments will differ from Spark's. When results are sorted,
 they will be identical to Spark. Unsorted results may have different row ordering.
 
+## Spark 4.0 Limitations
+
+The following limitations apply specifically when running Comet with Spark 4.0. These represent new Spark
+4.0 features that Comet does not yet support. Queries that use these features will fall back to Spark.
+
+### Variant Type
+
+Comet does not yet support the Variant data type introduced in Spark 4.0. All variant-related operations
+will fall back to Spark. Tracking issue: [#2209](https://github.com/apache/datafusion-comet/issues/2209)
+
+### Parquet Type Widening
+
+Comet's native Parquet reader does not support Spark 4.0's type widening feature, which allows reading
+Parquet columns whose types have been widened (e.g., `int` to `long`, `float` to `double`,
+`date` to `timestamp_ntz`). These reads will fall back to Spark.
+Tracking issue: [#3321](https://github.com/apache/datafusion-comet/issues/3321)
+
 ## Cast
 
 Cast operations in Comet fall into three levels of support:
diff --git a/docs/source/user-guide/latest/installation.md b/docs/source/user-guide/latest/installation.md
index f04e6359ba..ed856513d1 100644
--- a/docs/source/user-guide/latest/installation.md
+++ b/docs/source/user-guide/latest/installation.md
@@ -74,7 +74,7 @@ through the release vote. Release candidate jars can be found [here](https://rep
 - [Comet plugin for Spark 3.4 / Scala 2.13](https://repo1.maven.org/maven2/org/apache/datafusion/comet-spark-spark3.4_2.13/$COMET_VERSION/comet-spark-spark3.4_2.13-$COMET_VERSION.jar)
 - [Comet plugin for Spark 3.5 / Scala 2.12](https://repo1.maven.org/maven2/org/apache/datafusion/comet-spark-spark3.5_2.12/$COMET_VERSION/comet-spark-spark3.5_2.12-$COMET_VERSION.jar)
 - [Comet plugin for Spark 3.5 / Scala 2.13](https://repo1.maven.org/maven2/org/apache/datafusion/comet-spark-spark3.5_2.13/$COMET_VERSION/comet-spark-spark3.5_2.13-$COMET_VERSION.jar)
-- [Comet plugin for Spark 4.0 / Scala 2.13 (Experimental)](https://repo1.maven.org/maven2/org/apache/datafusion/comet-spark-spark4.0_2.13/$COMET_VERSION/comet-spark-spark4.0_2.13-$COMET_VERSION.jar)
+- [Comet plugin for Spark 4.0 / Scala 2.13](https://repo1.maven.org/maven2/org/apache/datafusion/comet-spark-spark4.0_2.13/$COMET_VERSION/comet-spark-spark4.0_2.13-$COMET_VERSION.jar)
 
 ## Building from source