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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,2 +1,15 @@
 # bf
 A very small Brainfuck interpreter
+
+To build, simply run make.
+
+Running the interpreter is simple:
+
+    $ ./bf input.bf
+
+The interpreter purposely does no error checking. If you don't specify an
+input file, it will crash. If there is an error reading the input file, it
+will crash.
+
+Program size is fixed at the same size as data space, which is controlled by
+`#define S`.