diff --git a/xs/src/libslic3r/GCodeWriter.hpp b/xs/src/libslic3r/GCodeWriter.hpp
index e9eff2e05..50c325dd4 100644
--- a/xs/src/libslic3r/GCodeWriter.hpp
+++ b/xs/src/libslic3r/GCodeWriter.hpp
@@ -23,7 +23,10 @@ public:
     std::string extrusion_axis() const { return this->_extrusion_axis; }
     void apply_print_config(const PrintConfig &print_config);
     void set_extruders(const std::vector<unsigned int> &extruder_ids);
+    /// Write any notes provided by the user as comments in the gcode header.
     std::string notes();
+
+    /// Actually write the preamble information.
     std::string preamble();
     std::string postamble() const;
     std::string set_temperature(unsigned int temperature, bool wait = false, int tool = -1) const;