diff --git a/typescript.html.markdown b/typescript.html.markdown
index 24d1db10..d351615b 100644
--- a/typescript.html.markdown
+++ b/typescript.html.markdown
@@ -37,6 +37,11 @@ let notSure: any = 4;
 notSure = "maybe a string instead";
 notSure = false; // okay, definitely a boolean
 
+// When we are not sure about the type, and don't want to use "any", we can use "unknown" type
+let unknownVariable: unknown = 'Some string'; // we don't fully know yet the type
+unknownVariable = 2; // possible
+const someVariable: string = unknownVariable; // Invalid; we can't assign unknownVariable to any other type (without an explicit assertion), unlike any
+
 // Use const keyword for constants
 const numLivesForCat = 9;
 numLivesForCat = 1; // Error