Add example for optional dependency in readme

Based on https://github.com/GREsau/schemars/pull/118/files
GREsau · Nov 25, 2021 · 3cac0e5 · 3cac0e5
1 parent 1a13ba9
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diff --git a/README.md b/README.md
@@ -275,3 +275,10 @@ Schemars can implement `JsonSchema` on types from several popular crates, enable
 - [`url`](https://crates.io/crates/url) (^2.0)
 - [`bytes`](https://crates.io/crates/bytes) (^1.0)
 - [`enumset`](https://crates.io/crates/enumset) (^1.0)
+
+For example, to implement `JsonSchema` on types from `chrono`, enable it as a feature in the `schemars` dependency in your `Cargo.toml` like so:
+
+```toml
+[dependencies]
+schemars = { version = "0.8", features = ["chrono"] }
+```
diff --git a/schemars/src/lib.rs b/schemars/src/lib.rs
@@ -270,6 +270,13 @@ Schemars can implement `JsonSchema` on types from several popular crates, enable
 - [`url`](https://crates.io/crates/url) (^2.0)
 - [`bytes`](https://crates.io/crates/bytes) (^1.0)
 - [`enumset`](https://crates.io/crates/enumset) (^1.0)
+
+For example, to implement `JsonSchema` on types from `chrono`, enable it as a feature in the `schemars` dependency in your `Cargo.toml` like so:
+
+```toml
+[dependencies]
+schemars = { version = "0.8", features = ["chrono"] }
+```
 */
 
 /// The map type used by schemars types.