Bug fixes, error checking; V1 complete

README.md

@@ -1,3 +1,13 @@
 # minihex
 
-A minimalist, single-file hexadecimal editor written in C with no dependencies (except the standard library). The program tries to be as simple as possible. Many bugs exist.
+A minimalist, single-file hexadecimal editor written in less than 100 lines of C with no dependencies (except the standard library). The program tries to be as simple as possible.
+Other features might be added in the future.
+
+## Usage
+
+```
+make
+./minihex <file>
+```
+
+To get help with the commands, do not provide any filename.