diff --git a/14_what_is_a_keyword.md b/14_what_is_a_keyword.md
new file mode 100644
index 0000000..8ca891e
--- /dev/null
+++ b/14_what_is_a_keyword.md
@@ -0,0 +1,12 @@
+# What is a keyword?
+
+We can't use a string as an argument name.
+
+```
+>>> def f(x, y, **kwargs):
+...     print(kwargs)
+
+>>> f(1, 2, Hello World=3)
+SyntaxError
+
+```