diff --git a/hasher/hasher-tests.ts b/hasher/hasher-tests.ts
index 5e988c7601..e250f4dad5 100644
--- a/hasher/hasher-tests.ts
+++ b/hasher/hasher-tests.ts
@@ -11,4 +11,6 @@ hasher.init(); //initialize hasher (start listening for history changes)
 
 hasher.setHash('foo'); //change hash value (generates new history record)
 
+hasher.appendHash = '?test=true';
+
 hasher.prependHash = '!'; //default value is "/"
diff --git a/hasher/index.d.ts b/hasher/index.d.ts
index b71b6b1d2b..180290145a 100644
--- a/hasher/index.d.ts
+++ b/hasher/index.d.ts
@@ -13,7 +13,7 @@ declare namespace HasherJs {
 
 		// {string} hasher.appendHash
 		// String that should always be added to the end of Hash value.
-		appendHash(): string;
+		appendHash: string;
 
 		// default value: '';
 		// will be automatically removed from `hasher.getHash()`