diff --git a/concurrency/semaphore/main.go b/synchronization/semaphore2/main.go
similarity index 100%
rename from concurrency/semaphore/main.go
rename to synchronization/semaphore2/main.go
diff --git a/concurrency/waitgroup/error_handling.go b/synchronization/waitgroup/error_handling.go
similarity index 100%
rename from concurrency/waitgroup/error_handling.go
rename to synchronization/waitgroup/error_handling.go
diff --git a/concurrency/waitgroup/main.go b/synchronization/waitgroup/main.go
similarity index 100%
rename from concurrency/waitgroup/main.go
rename to synchronization/waitgroup/main.go