diff --git a/examples/ch1.2/hello-01/main.go b/examples/ch2.1/hello-01/main.go
similarity index 100%
rename from examples/ch1.2/hello-01/main.go
rename to examples/ch2.1/hello-01/main.go
diff --git a/examples/ch1.2/hello-02/main.go b/examples/ch2.1/hello-02/main.go
similarity index 100%
rename from examples/ch1.2/hello-02/main.go
rename to examples/ch2.1/hello-02/main.go
diff --git a/examples/ch1.2/hello-03/hello.c b/examples/ch2.1/hello-03/hello.c
similarity index 100%
rename from examples/ch1.2/hello-03/hello.c
rename to examples/ch2.1/hello-03/hello.c
diff --git a/examples/ch1.2/hello-03/main.go b/examples/ch2.1/hello-03/main.go
similarity index 100%
rename from examples/ch1.2/hello-03/main.go
rename to examples/ch2.1/hello-03/main.go
diff --git a/examples/ch1.2/hello-04/main.go b/examples/ch2.1/hello-04/main.go
similarity index 100%
rename from examples/ch1.2/hello-04/main.go
rename to examples/ch2.1/hello-04/main.go
diff --git a/examples/ch1.2/hello-05/main.go b/examples/ch2.1/hello-05/main.go
similarity index 100%
rename from examples/ch1.2/hello-05/main.go
rename to examples/ch2.1/hello-05/main.go
diff --git a/examples/ch1.2/hello-06/main.go b/examples/ch2.1/hello-06/main.go
similarity index 100%
rename from examples/ch1.2/hello-06/main.go
rename to examples/ch2.1/hello-06/main.go