diff --git a/core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/io/csv.kt b/core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/io/csv.kt
index b5f22fc1c4..6f7abf87ac 100644
--- a/core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/io/csv.kt
+++ b/core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/io/csv.kt
@@ -19,7 +19,6 @@ import org.jetbrains.kotlinx.dataframe.codeGen.DefaultReadCsvMethod
 import org.jetbrains.kotlinx.dataframe.codeGen.DefaultReadDfMethod
 import org.jetbrains.kotlinx.dataframe.impl.api.parse
 import org.jetbrains.kotlinx.dataframe.impl.io.readDelimImpl
-import org.jetbrains.kotlinx.dataframe.io.ColType.String
 import org.jetbrains.kotlinx.dataframe.util.AS_URL
 import org.jetbrains.kotlinx.dataframe.util.AS_URL_IMPORT
 import org.jetbrains.kotlinx.dataframe.util.AS_URL_REPLACE
diff --git a/core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/jupyter/Integration.kt b/core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/jupyter/Integration.kt
index f93ef52aa2..12f1e15c2a 100644
--- a/core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/jupyter/Integration.kt
+++ b/core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/jupyter/Integration.kt
@@ -69,6 +69,10 @@ internal class Integration(private val notebook: Notebook, private val options:
 
     val version = options["v"]
 
+    // TODO temporary settings while these experimental modules are being developed
+    private val enableExperimentalCsv = options["enableExperimentalCsv"]
+    private val enableExperimentalGeo = options["enableExperimentalGeo"]
+
     private fun KotlinKernelHost.updateImportDataSchemaVariable(
         importDataSchema: ImportDataSchema,
         property: KProperty<*>,
@@ -152,6 +156,15 @@ internal class Integration(private val notebook: Notebook, private val options:
 
     override fun Builder.onLoaded() {
         if (version != null) {
+            if (enableExperimentalCsv?.toBoolean() == true) {
+                println("Enabling experimental CSV module: dataframe-csv")
+                dependencies("org.jetbrains.kotlinx:dataframe-csv:$version")
+            }
+            if (enableExperimentalGeo?.toBoolean() == true) {
+                println("Enabling experimental Geo module: dataframe-geo")
+                repositories("https://repo.osgeo.org/repository/release")
+                dependencies("org.jetbrains.kotlinx:dataframe-geo:$version")
+            }
             dependencies(
                 "org.jetbrains.kotlinx:dataframe-excel:$version",
                 "org.jetbrains.kotlinx:dataframe-jdbc:$version",
diff --git a/dataframe-csv/README.md b/dataframe-csv/README.md
new file mode 100644
index 0000000000..249bf559c3
--- /dev/null
+++ b/dataframe-csv/README.md
@@ -0,0 +1,7 @@
+## :dataframe-csv
+
+This module, published as `dataframe-csv`, contains all logic and tests for DataFrame to be able to work with `csv`
+files.
+
+At the moment, this module is in the experimental stage, so it's not included when
+you add the `dataframe` dependency to your project.
diff --git a/dataframe-csv/build.gradle.kts b/dataframe-csv/build.gradle.kts
index 0e27e1148b..115943e90c 100644
--- a/dataframe-csv/build.gradle.kts
+++ b/dataframe-csv/build.gradle.kts
@@ -28,7 +28,7 @@ repositories {
 }
 
 dependencies {
-    implementation(project(":core"))
+    api(project(":core"))
 
     // for csv reading
     api(libs.deephavenCsv)
diff --git a/dataframe-csv/generated-sources/tmp b/dataframe-csv/generated-sources/tmp
deleted file mode 100644
index e69de29bb2..0000000000
diff --git a/dataframe-csv/src/main/kotlin/org/jetbrains/kotlinx/dataframe/impl/io/ListSink.kt b/dataframe-csv/src/main/kotlin/org/jetbrains/kotlinx/dataframe/impl/io/ListSink.kt
index 5f784013fe..5c7cc5013f 100644
--- a/dataframe-csv/src/main/kotlin/org/jetbrains/kotlinx/dataframe/impl/io/ListSink.kt
+++ b/dataframe-csv/src/main/kotlin/org/jetbrains/kotlinx/dataframe/impl/io/ListSink.kt
@@ -54,7 +54,7 @@ internal class ListSink(val columnIndex: Int, val dataType: DataType) : SinkSour
         )
     }
 
-    private val _data: MutableList<Any?> = mutableListOf()
+    private val _data: MutableList<Any?> = ArrayList(1000)
 
     val data: List<Any?>
         get() = _data