diff --git a/IDEAS.md b/IDEAS.md
new file mode 100644
index 0000000..f1f2be2
--- /dev/null
+++ b/IDEAS.md
@@ -0,0 +1,15 @@
+# Ergonomy ideas
+
+- `Default` / `thread_local` global: `ez_urandom::random_u64()` without
+  constructing or threading an `OsRandom`.
+- `gen_range` for all int widths (currently only `u32`) plus a `Range` /
+  `RangeInclusive` overload.
+- `fill_bytes(&mut [u8])` convenience so callers don't need to import
+  `io::Read`.
+- `bool()` / `f64()` (unit interval) helpers.
+- `shuffle(&mut [T])` and `choose<T>(&[T]) -> &T` — generic, not just bytes.
+- Accept a `&str` alphabet directly (not just `&[u8]`) and drop the ASCII
+  assert by iterating `chars()`.
+- Loosen `&mut self` to `&self` via interior buffering, or impl `Clone`, so
+  multiple call sites don't fight the borrow checker.
+- Builder / presets: `OsRandom::password(len)`, `::hex(len)`, `::token(len)`.