diff --git a/subjects/Computer Science/unit4.json b/subjects/Computer Science/unit4.json
index 5e3f092..ff6caf0 100644
--- a/subjects/Computer Science/unit4.json	
+++ b/subjects/Computer Science/unit4.json	
@@ -37,7 +37,7 @@
     },
     {
         "term": "Clock speed",
-        "meaning": "The number of cycles per second that a computer can perform"
+        "meaning": "The number of cycles per second that a computer can perform. Measured in Hertz (Hz)"
     },
     {
         "term": "Cloud storage",