diff --git a/lib/init.lua b/lib/init.lua
index 3c8bc62..d32db04 100644
--- a/lib/init.lua
+++ b/lib/init.lua
@@ -290,6 +290,13 @@ function Promise.prototype:catch(failureCallback)
 	return self:andThen(nil, failureCallback)
 end
 
+--[[
+	Used to set a callback for when the promise resolves OR rejects.
+]]
+function Promise.prototype:finally(finallyCallback)
+	return self:andThen(finallyCallback, finallyCallback)
+end
+
 --[[
 	Yield until the promise is completed.