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diff --git a/options.h b/options.h
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+/*********************************************************************
+ * kd-forest                                                         *
+ * Copyright (C) 2014 Tavian Barnes <tavianator@tavianator.com>      *
+ *                                                                   *
+ * This program is free software. It comes without any warranty, to  *
+ * the extent permitted by applicable law. You can redistribute it   *
+ * and/or modify it under the terms of the Do What The Fuck You Want *
+ * To Public License, Version 2, as published by Sam Hocevar. See    *
+ * the COPYING file or http://www.wtfpl.net/ for more details.       *
+ *********************************************************************/
+
+#ifndef OPTIONS_H
+#define OPTIONS_H
+
+#include <stdbool.h>
+#include <stdio.h>
+
+// Possible generation modes
+typedef enum {
+  MODE_HUE_SORT,
+  MODE_RANDOM,
+} mode_t;
+
+// Possible color spaces
+typedef enum {
+  COLOR_SPACE_RGB,
+  COLOR_SPACE_LAB,
+  COLOR_SPACE_LUV,
+} color_space_t;
+
+// Command-line options
+typedef struct {
+  unsigned int bit_depth;
+  mode_t mode;
+  color_space_t color_space;
+  bool animate;
+  const char *filename;
+  unsigned int seed;
+  bool help;
+} options_t;
+
+bool parse_options(options_t *options, int argc, char *argv[]);
+void print_usage(FILE *file, const char *command);
+
+#endif // OPTIONS_H