lesson 16 grammar

docs/index.md

@@ -27,3 +27,4 @@ hero:
 - [Lesson 13: and, with, to, from, for, about](./howtostudykorean/unit-1/13-and-with.md)
 - [Lesson 14: Passive Verbs](./howtostudykorean/unit-1/14-passive.md)
 - [Lesson 15: 들다, Homonyms, Being Sick, Different/Similar/Same](./howtostudykorean/unit-1/15-good-carry-similar.md)
+- [Lesson 16: Noun + ~적, ~적으로, ~적이다, ~스럽다](./howtostudykorean/unit-1/16-relating-to.md)