diff --git a/conf/build.test.properties b/conf/build.test.properties
index a7281d69..6bcfe34e 100644
--- a/conf/build.test.properties
+++ b/conf/build.test.properties
@@ -3,7 +3,6 @@ build.artifact_mode=symlink
 build.test_output=/dev/null
 drupal.site_name=drupal-skeleton
 drupal.profile=standard
-drupal.modules_enable=
 drupal.database.database=circle_test
 drupal.database.username=ubuntu
 drupal.database.password=
diff --git a/docs/properties.md b/docs/properties.md
index 095eb5b9..8754e8e7 100644
--- a/docs/properties.md
+++ b/docs/properties.md
@@ -21,7 +21,7 @@ Yields:
 
 Cool! This phing-ism is what powers our environment-specific property layering and loading:
 
-1. Properties are loaded from the phing call itself; for example, adding the flag `-Ddrupal.modules_enable=devel,kint` will set the `drupal.modules_enable` property to `devel,kint`
+1. Properties are loaded from the phing call itself; for example, adding the flag `-Dbuild.test_output=artifacts/tests` will set the `build.test_output` property to `artifacts/tests`
 1. Set the `build.env` property (if it's not already set with `-D`) from the `PALANTIR_ENVIRONMENT` environment variable; if you're using [the-vagrant](https://github.com/palantirnet/the-vagrant), this will be set to `vagrant`
 1. Load properties from your `conf/build.[environment].properties`
 1. Load properties from `conf/build.default.properties`
@@ -46,7 +46,6 @@ Cool! This phing-ism is what powers our environment-specific property layering a
 |---|---|---|
 | `drupal.site_name` | `Drupal` | Human-readable name for your site. |
 | `drupal.profile` | `config_installer` | Install profile. |
-| `drupal.modules_enable` | | Comma-separated list of modules to enable after installing Drupal. |
 | `drupal.database.database` | `drupal` |  |
 | `drupal.database.username` | `root` |  |
 | `drupal.database.password` | `root` |  |
diff --git a/tasks/drupal.xml b/tasks/drupal.xml
index 74ccc80e..6b0eaee0 100644
--- a/tasks/drupal.xml
+++ b/tasks/drupal.xml
@@ -37,7 +37,6 @@
     <property name="drupal.database.username" value="drupal" />
     <property name="drupal.database.password" value="drupal" />
     <property name="drupal.database.host" value="127.0.0.1" />
-    <property name="drupal.modules_enable" value="" />
     <property name="drupal.twig.debug" value="false" />
     <property name="drupal.config_sync_directory" value="../conf/drupal/config" /> <!-- pantheon = private/config -->
     <property name="build.drupal.settings" value="conf/drupal/settings.php" />
@@ -76,9 +75,6 @@
             <property name="prompt.drupal.profile" value="Drupal install profile" />
             <property name="default.drupal.profile" value="standard" />
 
-            <property name="prompt.drupal.modules_enable" value="Comma-separated list of modules to enable after install" />
-            <property name="default.drupal.modules_enable" value="" />
-
             <property name="prompt.drupal.database.database" value="Drupal database name" />
             <property name="default.drupal.database.database" value="drupal" />
 
@@ -101,7 +97,7 @@
             <!-- Generated hash salt -->
             <property name="default.drupal.hash_salt" value="${hash_salt}" />
 
-            <property name="update" value="drupal.site_name,drupal.profile,drupal.modules_enable,drupal.database.database,drupal.database.username,drupal.database.password,drupal.database.host" />
+            <property name="update" value="drupal.site_name,drupal.profile,drupal.database.database,drupal.database.username,drupal.database.password,drupal.database.host" />
             <property name="dump" value="drupal.settings.file_public_path,drupal.settings.file_private_path,drupal.twig.debug,drupal.uri,drupal.hash_salt,drupal.root" />
         </phing>
     </target>
@@ -194,7 +190,6 @@
         <fail unless="drupal.site_name" />
         <fail unless="drupal.sites_subdir" />
         <fail unless="drupal.profile" />
-        <fail unless="drupal.modules_enable" />
 
         <phingcall target="validate-clean-conf" />
 
@@ -234,19 +229,26 @@
             <param>${drupal.profile}</param>
         </drush>
 
-        <foreach list="${drupal.modules_enable}" param="module" target="drupal-enable-module" />
+        <!-- @todo Remove this conditional in release 2.0 -->
+        <if>
+            <not><equals arg1="${drupal.modules_enable}" arg2="" /></not>
+            <then>
+                <echo level="warning" msg="The 'drupal.modules_enable' property has been deprecated; please update your build to manage per-environment configuration with the Config Split module instead (https://www.drupal.org/project/config_split)" />
+            </then>
+        </if>
 
         <!-- The public files directory, and everything in it, needs to be world writable. -->
         <exec command="chmod -R 777 ${drupal.settings.file_public_path.resolved}" checkreturn="true" />
     </target>
 
 
-    <!-- Target: drupal-enable-module -->
+    <!--
+        Target: drupal-enable-module
+
+        @todo Remove this target in release 2.0
+        -->
     <target name="drupal-enable-module">
-        <fail unless="module" />
-        <drush command="pm-enable" assume="yes">
-            <param>${module}</param>
-        </drush>
+        <echo level="warning" msg="The 'drupal-enable-module' target has been deprecated; please update your build to manage per-environment configuration with the Config Split module instead (https://www.drupal.org/project/config_split)" />
     </target>