diff --git a/HACKING b/HACKING
new file mode 100644
index 0000000..4d75104
--- /dev/null
+++ b/HACKING
@@ -0,0 +1,9 @@
+Coding style
+============
+
+* indent with 2 spaces
+* opening curly braces on a new line
+* function and method names camelCase, with lowercase first letter
+* class names CamelCase
+* private data members with an underscore as a prefix: _likeThis
+* file names all lowercase