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diff --git a/Marlin/src/module/planner_bezier.h b/Marlin/src/module/planner_bezier.h
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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * 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/>.
+ *
+ */
+#pragma once
+
+/**
+ * planner_bezier.h
+ *
+ * Compute and buffer movement commands for Bézier curves
+ */
+
+#include "../core/types.h"
+
+void cubic_b_spline(
+  const xyze_pos_t &position,       // current position
+  const xyze_pos_t &target,         // target position
+  const xy_pos_t (&offsets)[2],     // a pair of offsets
+  const feedRate_t &scaled_fr_mm_s, // mm/s scaled by feedrate %
+  const uint8_t extruder
+);