diff --git a/docs/migrationGuide.adoc b/docs/migrationGuide.adoc
index 93119af84a..12b12bb77b 100644
--- a/docs/migrationGuide.adoc
+++ b/docs/migrationGuide.adoc
@@ -6,6 +6,15 @@ Especially the following aspects have changed through the various different rele
 
 == DB UI Core 3.0.0 Migration Guide
 
+=== Using SCSS/SASS sources
+
+==== Compiler
+
+We've removed the following files, that we already deprecated within the previous major version:
+- `@db-ui/core/sources/css/enterprise/db-ui-core-include.scss`
+- `@db-ui/core/sources/css/enterprise/db-ui-core-rollup.scss`
+- `@db-ui/core/sources/css/enterprise/db-ui-core-webpack.scss`
+
 === progress
 
 We've remove the deprecated previous HTML implementation of the label by an `output` element and replaced it by an actual `label` element. Necessary changes:
diff --git a/source/css/enterprise/db-ui-core-include.scss b/source/css/enterprise/db-ui-core-include.scss
deleted file mode 100644
index 8018f87c7e..0000000000
--- a/source/css/enterprise/db-ui-core-include.scss
+++ /dev/null
@@ -1,3 +0,0 @@
-// Deprecated: This file shouldn't get used / included anymore.
-// Either `@import` the file `@db-ui/core/sources/css/rollup.assets-paths` or `@db-ui/core/sources/css/webpack.assets-paths` depending on your bundler, previous to `@import`ing e.g. the file `@db-ui/core/sources/css/enterprise/db-ui-core` directly from now on.
-@import "db-ui-core-webpack";
diff --git a/source/css/enterprise/db-ui-core-rollup.scss b/source/css/enterprise/db-ui-core-rollup.scss
deleted file mode 100644
index 51623c1f6c..0000000000
--- a/source/css/enterprise/db-ui-core-rollup.scss
+++ /dev/null
@@ -1,4 +0,0 @@
-// Deprecated: This file shouldn't get used / included anymore.
-// Either `@import` the file `@db-ui/core/sources/css/rollup.assets-paths`, previous to `@import`ing e.g. the file `@db-ui/core/sources/css/enterprise/db-ui-core` directly from now on.
-@import "../rollup.assets-paths";
-@import "db-ui-core";
diff --git a/source/css/enterprise/db-ui-core-webpack.scss b/source/css/enterprise/db-ui-core-webpack.scss
deleted file mode 100644
index 60e988de32..0000000000
--- a/source/css/enterprise/db-ui-core-webpack.scss
+++ /dev/null
@@ -1,4 +0,0 @@
-// Deprecated: This file shouldn't get used / included anymore.
-// `@import` the file `@db-ui/core/sources/css/webpack.assets-paths`, previous to `@import`ing e.g. the file `@db-ui/core/sources/css/enterprise/db-ui-core` directly from now on.
-@import "../webpack.assets-paths";
-@import "db-ui-core";