diff --git a/README.md b/README.md
index 6de516dfc1c3287dbd787a1feaf1ce5056cee1ef..8ff0d81d7d251041569689f3b2c3f78002eeedb6 100644
--- a/README.md
+++ b/README.md
@@ -138,6 +138,36 @@ | `color.BLACK`      | 0       | 0         | 0        | 255       |
 | `color.BLANK`      | 0       | 0         | 0        | 0         |
 | `color.MAGENTA`    | 255     | 0         | 255      | 255       |
 
+#### Using custom colors
+
+Color is essentially a structure with RGBA data. So constructing new colors is
+very easy.
+
+Alpha channel can be omitted and will by default be 255.
+
+```lua
+-- my_game.lua
+
+open_window(800, 800, "My Game")
+set_fps(60)
+
+my_color1 = { r = 200, g = 200, b = 200, a = 255 }
+my_color2 = { r = 200, g = 200, b = 200 }
+
+while window_running() do
+    start_drawing()
+    clear_window(color.BLACK)
+
+    draw_rect(100, 100, 100, 100, my_color1)
+    draw_rect(300, 100, 100, 100, my_color2)
+
+    draw_info()
+    stop_drawing()
+end
+
+close_window()
+```
+
 ## Libraries & Assets
 
 - https://github.com/rxi/microtar
diff --git a/main.c b/main.c
index aa72b330c14fc824822b00e8feb592c49a0150da..e895f2a8ce4b0bdf55bb50e5b6aa1d85880a4857 100644
--- a/main.c
+++ b/main.c
@@ -528,7 +528,7 @@
 static void help(const char *argv0) {
 	printf("Usage: %s [options]\n"
 			"\nAvailable options:\n"
-			"  -r,--run=file.lua       run input file\n"
+			"  -f,--file=file.lua       run input file\n"
 			"  -b,--bundle             bundles this folder\n"
 			"  -d,--debug              prints debug information\n"
 			"  -h,--help               this help\n"
@@ -550,7 +550,7 @@ 	const char *run_file = NULL;
 
 	const char short_options[] = "f:dbhv";
 	const struct option long_options[] = {
-		{ "file", 1, NULL, 'r' },
+		{ "file", 1, NULL, 'f' },
 		{ "debug", 0, NULL, 'd' },
 		{ "bundle", 0, NULL, 'b' },
 		{ "help", 0, NULL, 'h' },