diff --git a/substrate/primitives/externalities/src/lib.rs b/substrate/primitives/externalities/src/lib.rs
index 431e449846..fa0f9e4454 100644
--- a/substrate/primitives/externalities/src/lib.rs
+++ b/substrate/primitives/externalities/src/lib.rs
@@ -203,13 +203,21 @@ pub trait Externalities: ExtensionStore {
 	/// Returns the SCALE encoded hash.
 	fn storage_changes_root(&mut self, parent: &[u8]) -> Result<Option<Vec<u8>>, ()>;
 
-	fn wipe(&mut self) {
-		unimplemented!()
-	}
+	/// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+	/// Benchmarking related functionality and shouldn't be used anywhere else!
+	/// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+	///
+	/// Wipes all changes from caches and the database.
+	///
+	/// The state will be reset to genesis.
+	fn wipe(&mut self);
 
-	fn commit(&mut self) {
-		unimplemented!()
-	}
+	/// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+	/// Benchmarking related functionality and shouldn't be used anywhere else!
+	/// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+	///
+	/// Commits all changes to the database and clears all caches.
+	fn commit(&mut self);
 }
 
 /// Extension for the [`Externalities`] trait.
diff --git a/substrate/primitives/state-machine/src/basic.rs b/substrate/primitives/state-machine/src/basic.rs
index d905657737..966648bc82 100644
--- a/substrate/primitives/state-machine/src/basic.rs
+++ b/substrate/primitives/state-machine/src/basic.rs
@@ -298,6 +298,10 @@ impl Externalities for BasicExternalities {
 	fn storage_changes_root(&mut self, _parent: &[u8]) -> Result<Option<Vec<u8>>, ()> {
 		Ok(None)
 	}
+
+	fn wipe(&mut self) {}
+
+	fn commit(&mut self) {}
 }
 
 impl sp_externalities::ExtensionStore for BasicExternalities {