diff --git a/plugins/spectral_compressor/src/analyzer.rs b/plugins/spectral_compressor/src/analyzer.rs
index ca413aba..901d6a9f 100644
--- a/plugins/spectral_compressor/src/analyzer.rs
+++ b/plugins/spectral_compressor/src/analyzer.rs
@@ -1,3 +1,19 @@
+// Spectral Compressor: an FFT based compressor
+// Copyright (C) 2021-2023 Robbert van der Helm
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 /// The data stored used for the spectrum analyzer. This also contains the gain reduction and the
 /// threshold curve (which is dynamic in the sidechain matching mode).
 ///