diff --git a/src/main/java/qupath/fx/dialogs/ControlsFXNotifications.java b/src/main/java/qupath/fx/dialogs/ControlsFXNotifications.java
index 02509fd..4dc8dd4 100644
--- a/src/main/java/qupath/fx/dialogs/ControlsFXNotifications.java
+++ b/src/main/java/qupath/fx/dialogs/ControlsFXNotifications.java
@@ -1,3 +1,19 @@
+/**
+ * Copyright 2023 The University of Edinburgh
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package qupath.fx.dialogs;
 
 import javafx.application.Platform;
@@ -6,6 +22,10 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+/**
+ * Class for showing notifications using ControlsFX.
+ * Separated from the main {@link Dialogs} class to help make ControlsFX optional.
+ */
 class ControlsFXNotifications {
 
     private static final Logger logger = LoggerFactory.getLogger(ControlsFXNotifications.class);
diff --git a/src/test/java/qupath/fx/prefs/converters/TestEnumConverter.java b/src/test/java/qupath/fx/prefs/converters/TestEnumConverter.java
index ad9b0a8..779e35c 100644
--- a/src/test/java/qupath/fx/prefs/converters/TestEnumConverter.java
+++ b/src/test/java/qupath/fx/prefs/converters/TestEnumConverter.java
@@ -1,3 +1,19 @@
+/**
+ * Copyright 2023 The University of Edinburgh
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package qupath.fx.prefs.converters;
 
 import org.junit.jupiter.api.Test;
diff --git a/src/test/java/qupath/fx/prefs/converters/TestFileConverter.java b/src/test/java/qupath/fx/prefs/converters/TestFileConverter.java
index 39f9dcd..19e017a 100644
--- a/src/test/java/qupath/fx/prefs/converters/TestFileConverter.java
+++ b/src/test/java/qupath/fx/prefs/converters/TestFileConverter.java
@@ -1,3 +1,19 @@
+/**
+ * Copyright 2023 The University of Edinburgh
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package qupath.fx.prefs.converters;
 
 import org.junit.jupiter.params.ParameterizedTest;
diff --git a/src/test/java/qupath/fx/prefs/converters/TestLocaleConverter.java b/src/test/java/qupath/fx/prefs/converters/TestLocaleConverter.java
index 3cd4a80..352e98a 100644
--- a/src/test/java/qupath/fx/prefs/converters/TestLocaleConverter.java
+++ b/src/test/java/qupath/fx/prefs/converters/TestLocaleConverter.java
@@ -1,3 +1,19 @@
+/**
+ * Copyright 2023 The University of Edinburgh
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package qupath.fx.prefs.converters;
 
 import org.junit.jupiter.api.Test;
diff --git a/src/test/java/qupath/fx/prefs/converters/TestPathConverter.java b/src/test/java/qupath/fx/prefs/converters/TestPathConverter.java
index 49df48e..878fe0c 100644
--- a/src/test/java/qupath/fx/prefs/converters/TestPathConverter.java
+++ b/src/test/java/qupath/fx/prefs/converters/TestPathConverter.java
@@ -1,3 +1,19 @@
+/**
+ * Copyright 2023 The University of Edinburgh
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package qupath.fx.prefs.converters;
 
 import org.junit.jupiter.params.ParameterizedTest;
diff --git a/src/test/java/qupath/fx/prefs/converters/TestUriConverter.java b/src/test/java/qupath/fx/prefs/converters/TestUriConverter.java
index ad5ad12..1a4256f 100644
--- a/src/test/java/qupath/fx/prefs/converters/TestUriConverter.java
+++ b/src/test/java/qupath/fx/prefs/converters/TestUriConverter.java
@@ -1,3 +1,19 @@
+/**
+ * Copyright 2023 The University of Edinburgh
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package qupath.fx.prefs.converters;
 
 import org.junit.jupiter.params.ParameterizedTest;