diff --git a/pmd-ui/src/main/resources/net/sourceforge/pmd/util/fxdesigner/less/constants.less b/pmd-ui/src/main/resources/net/sourceforge/pmd/util/fxdesigner/less/constants.less
index f0895b195a..e7472d9c7e 100644
--- a/pmd-ui/src/main/resources/net/sourceforge/pmd/util/fxdesigner/less/constants.less
+++ b/pmd-ui/src/main/resources/net/sourceforge/pmd/util/fxdesigner/less/constants.less
@@ -1,3 +1,7 @@
+/**
+ * BSD-style license; for more info see http://pmd.sourceforge.net/license.html
+ */
+
 /*
   App-wide color constants and useful mixins.
 
diff --git a/pmd-ui/src/main/resources/net/sourceforge/pmd/util/fxdesigner/less/designer.less b/pmd-ui/src/main/resources/net/sourceforge/pmd/util/fxdesigner/less/designer.less
index a64412b05d..91a3fd565d 100644
--- a/pmd-ui/src/main/resources/net/sourceforge/pmd/util/fxdesigner/less/designer.less
+++ b/pmd-ui/src/main/resources/net/sourceforge/pmd/util/fxdesigner/less/designer.less
@@ -1,3 +1,7 @@
+/**
+ * BSD-style license; for more info see http://pmd.sourceforge.net/license.html
+ */
+
 /*
  * Base sheet for the whole app
  */
diff --git a/pmd-ui/src/main/resources/net/sourceforge/pmd/util/fxdesigner/less/editor-theme.less b/pmd-ui/src/main/resources/net/sourceforge/pmd/util/fxdesigner/less/editor-theme.less
index a8f3918c57..0e434691c1 100644
--- a/pmd-ui/src/main/resources/net/sourceforge/pmd/util/fxdesigner/less/editor-theme.less
+++ b/pmd-ui/src/main/resources/net/sourceforge/pmd/util/fxdesigner/less/editor-theme.less
@@ -1,3 +1,7 @@
+/**
+ * BSD-style license; for more info see http://pmd.sourceforge.net/license.html
+ */
+
 /* Presets for the editor theme and syntax highlighting.
 
    * CSS reference of the code area:
diff --git a/pmd-ui/src/main/resources/net/sourceforge/pmd/util/fxdesigner/less/syntax-highlighting.less b/pmd-ui/src/main/resources/net/sourceforge/pmd/util/fxdesigner/less/syntax-highlighting.less
index eac07355b1..5c8897f2da 100644
--- a/pmd-ui/src/main/resources/net/sourceforge/pmd/util/fxdesigner/less/syntax-highlighting.less
+++ b/pmd-ui/src/main/resources/net/sourceforge/pmd/util/fxdesigner/less/syntax-highlighting.less
@@ -1,3 +1,7 @@
+/**
+ * BSD-style license; for more info see http://pmd.sourceforge.net/license.html
+ */
+
 /*
   Rules for the syntax highlighters.
   This file doesn't include highlight rules, so that highlight is not displayed