diff --git a/HISTORY.md b/HISTORY.md
index a9daf473..74dbe0fc 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,5 +1,11 @@
 # AdvancedHMC Changelog
 
+## 0.8.5
+
+  - `rand_momentum(rng, metric, kinetic, θ)` is now part of the public API (exported).
+    Packages that extend AdvancedHMC with custom metric types can implement this method
+    without depending on an internal symbol.
+
 ## 0.8.4
 
   - Introduces an experimental way to improve the *diagonal* mass matrix adaptation using gradient information (similar to [nutpie](https://github.com/pymc-devs/nutpie)),
diff --git a/Project.toml b/Project.toml
index f38dda02..86905b6a 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "AdvancedHMC"
 uuid = "0bf59076-c3b1-5ca4-86bd-e02cd72cde3d"
-version = "0.8.4"
+version = "0.8.5"
 
 [deps]
 AbstractMCMC = "80f14c24-f653-4e6a-9b94-39d6b0f70001"
diff --git a/src/AdvancedHMC.jl b/src/AdvancedHMC.jl
index 5db7644c..b321cadf 100644
--- a/src/AdvancedHMC.jl
+++ b/src/AdvancedHMC.jl
@@ -40,7 +40,7 @@ struct GaussianKinetic <: AbstractKinetic end
 export GaussianKinetic
 
 include("metric.jl")
-export UnitEuclideanMetric, DiagEuclideanMetric, DenseEuclideanMetric
+export UnitEuclideanMetric, DiagEuclideanMetric, DenseEuclideanMetric, rand_momentum
 
 include("hamiltonian.jl")
 export Hamiltonian