diff --git a/CHANGELOG.md b/CHANGELOG.md
index 80a7d4a..0e546f2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,13 @@ All notable changes to this project will be documented in this file.
 
 -
 
+# [0.3.1] - 2023-02-16
+
+### Added
+
+- `with_prefix` to `PrometheusMetricLayerBuilder`, which can be used to rename the default prefix (`axum`) for all metrics. This is especially useful when
+  working with cargo workspaces that has more than one `axum_prometheus` instance (since environment variables don't work there).
+
 ## [0.3.0] - 2023-01-04
 
 ### Added
@@ -46,6 +53,7 @@ All notable changes to this project will be documented in this file.
 
 First version.
 
-[unreleased]: https://github.com/Ptrskay3/axum-prometheus/compare/master...release/0.3
+[unreleased]: https://github.com/Ptrskay3/axum-prometheus/compare/master...release/0.3.1
 [0.2.0]: https://github.com/Ptrskay3/axum-prometheus/compare/9fb600d7d9ac2e6d38e6399119fc7ba7f25d5fe0...756dc67bf2baae2de406e012bdaa2334ce0fcdcb
 [0.3.0]: https://github.com/Ptrskay3/axum-prometheus/compare/axum-0.6...release/0.3
+[0.3.1]: https://github.com/Ptrskay3/axum-prometheus/compare/master...release/0.3.1
diff --git a/Cargo.toml b/Cargo.toml
index 9195f00..a4515ea 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "axum-prometheus"
-version = "0.3.0"
+version = "0.3.1"
 edition = "2021"
 homepage = "https://github.com/Ptrskay3/axum-prometheus"
 license = "MIT"
@@ -23,7 +23,7 @@ tokio = { version = "1.20.1", features = ["rt-multi-thread", "macros"] }
 tower-http = "0.3.4"
 bytes = "1.2.1"
 futures-core = "0.3.24"
-matchit = "0.6"
+matchit = "0.7"
 once_cell = "1.17.0"
 
 [dev-dependencies]
diff --git a/README.md b/README.md
index f6d4566..21f8957 100644
--- a/README.md
+++ b/README.md
@@ -43,6 +43,8 @@ AXUM_HTTP_REQUESTS_DURATION_SECONDS = "my_app_requests_duration_seconds"
 AXUM_HTTP_REQUESTS_PENDING = "my_app_requests_pending"
 ```
 
+..or optionally use [`PrometheusMetricLayerBuilder::with_prefix`] function.
+
 ### Compatibility
 
 | Axum Version | Crate Version |
@@ -58,7 +60,7 @@ Add `axum-prometheus` to your `Cargo.toml`.
 
 ```toml
 [dependencies]
-axum-prometheus = "0.3.0"
+axum-prometheus = "0.3.1"
 ```
 
 Then you instantiate the prometheus middleware:
diff --git a/examples/builder-example/src/main.rs b/examples/builder-example/src/main.rs
index 08dba57..f08b7ee 100644
--- a/examples/builder-example/src/main.rs
+++ b/examples/builder-example/src/main.rs
@@ -23,6 +23,7 @@ async fn main() {
         .init();
 
     let (prometheus_layer, metric_handle) = PrometheusMetricLayerBuilder::new()
+        .with_prefix("builder-example")
         // ignore reporting requests that match "/metrics"
         .with_ignore_pattern("/metrics")
         // if the any of the second argument matches, report them at the `/foo` endpoint
diff --git a/src/lib.rs b/src/lib.rs
index 6965add..9888f2d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -26,6 +26,8 @@
 //! AXUM_HTTP_REQUESTS_PENDING = "my_app_requests_pending"
 //! ```
 //!
+//! ..or optionally use [`PrometheusMetricLayerBuilder::with_prefix`] function.
+//!
 //! ## Usage
 //!
 //! For more elaborate use-cases, see the builder-example that leverages [`PrometheusMetricLayerBuilder`].
@@ -33,7 +35,7 @@
 //! Add `axum-prometheus` to your `Cargo.toml`.
 //! ```not_rust
 //! [dependencies]
-//! axum-prometheus = "0.3.0"
+//! axum-prometheus = "0.3.1"
 //! ```
 //!
 //! Then you instantiate the prometheus middleware:
@@ -115,8 +117,11 @@ pub const AXUM_HTTP_REQUESTS_TOTAL: &str = match option_env!("AXUM_HTTP_REQUESTS
     None => "axum_http_requests_total",
 };
 
+#[doc(hidden)]
 pub static PREFIXED_HTTP_REQUESTS_TOTAL: OnceCell<String> = OnceCell::new();
+#[doc(hidden)]
 pub static PREFIXED_HTTP_REQUESTS_DURATION_SECONDS: OnceCell<String> = OnceCell::new();
+#[doc(hidden)]
 pub static PREFIXED_HTTP_REQUESTS_PENDING: OnceCell<String> = OnceCell::new();
 
 use std::borrow::Cow;