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diff --git a/README.md b/README.md
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+++ b/README.md
@@ -1,4 +1,19 @@
 brainfuck
 =========
 
-brainfuck
+Brainfuck is represented by an array with 30,000 cells initialized to zero
+and a data pointer pointing at the current cell.
+
+There are eight commands:
+```
++ : Increments the value at the current cell by one.
+- : Decrements the value at the current cell by one.
+> : Moves the data pointer to the next cell (cell on the right).
+< : Moves the data pointer to the previous cell (cell on the left).
+. : Prints the ASCII value at the current cell (i.e. 65 = 'A').
+, : Reads a single input character into the current cell.
+[ : If the value at the current cell is zero, skips to the corresponding ] .
+    Otherwise, move to the next instruction.
+] : If the value at the current cell is zero, move to the next instruction.
+    Otherwise, move backwards in the instructions to the corresponding [ .
+```
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