diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..bcab8de
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,10 @@
+//! Format numbers
+//!
+//! This crate contains several utility functions for formatting numbers
+//! into other systems, such as converting decimal numbers to hexadecimal.
+//!
+//! See [Format] for supported formats.
+//!
+//! Note that this crate is primarily used as a executable.
+
+pub mod format;