diff --git a/knockout/knockout.d.ts b/knockout/knockout.d.ts
index 0beebeb3e..d46879018 100644
--- a/knockout/knockout.d.ts
+++ b/knockout/knockout.d.ts
@@ -15,6 +15,7 @@ interface KnockoutSubscribableFunctions {
 
 interface KnockoutComputedFunctions extends KnockoutSubscribableFunctions {
     getDependenciesCount(): number;
+    getSubscriptionsCount(): number;
     hasWriteFunction(): boolean;
 }