diff --git a/docs/lectures/osc/04_concurrency1.md b/docs/lectures/osc/04_concurrency1.md
index 7bcb9ba..0706adb 100644
--- a/docs/lectures/osc/04_concurrency1.md
+++ b/docs/lectures/osc/04_concurrency1.md
@@ -155,7 +155,7 @@ Deadlocks have to be prevented as well.
 
 A set of processes/threads is *deadlocked* if each process/thread in the set is waiting for an event that only the other process/thread in the set can cause
 
-Each **deadlocked process/thread** is waiting for a resource held by another deadlocked process/thread (which cannot run and hence release the resource) .
+Each **deadlocked process/thread** is waiting for a resource held by another deadlocked process/thread (which cannot run and hence release the resource).
 
 * Assume that X and Y are **mutually exclusive resources**.
 * Thread A and B need to **acquire both resources** and request them in oppose orders.