diff --git a/bmp2font.c b/bmp2font.c
index d9a2066..cfef059 100644
--- a/bmp2font.c
+++ b/bmp2font.c
@@ -1,3 +1,13 @@
+/* This script os meant to convert a 256x256 pixel bitmap into an bitmap of
+ * 8x8 pixel characters. When deciding upon the output format, i had the
+ * video output of scanlines in mind. So there are 8 sections for each row
+ * of pixels for a character cell, each secton containing the the pixel line
+ * data of all 256 character codes. If you align this blob to 256-bytes, you
+ * quickly fetch the data by pointing bx to the begin of the section for the
+ * pixel line you are currently drawing, then set bl to the character value
+ * you want to print and dereference [bx].
+ */
+
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/stat.h>