diff --git a/README b/README
index 5aafa3e..b22a95b 100644
--- a/README
+++ b/README
@@ -1 +1,9 @@
                            INFIX CALCULATOR
+
+This is a little infix calculator program I made for fun and practise.
+It's written in ISO C11; the build script uses Clang but it should be
+OK with most compilers.
+
+	sh scripts/build.sh    # Builds everything
+	sh scripts/test.sh     # Run the unit tests
+	build/infix-calculator # Run the actual calculator