diff --git a/Half-Life Source.md b/Half-Life Source.md
index 0752b3f..af5f579 100644
--- a/Half-Life Source.md	
+++ b/Half-Life Source.md	
@@ -50,6 +50,10 @@ Alfred attempted to fix this by adding the ignorez command to the VMTs for all o
 
 # 2/2 EVERYTHING ELSE. STILL IMPORTANT THOUGH!
 
+## Bug: Yaw Speed is TOO fast on all HL monsters.
+
+For whatever reason, there's some major difference between GoldSource's SetYawSpeed and Source's MaxYawSpeed. This results in all monsters in Half-Life: Source rotating too fast. This is why the Scientists starts spinning when freaked out.
+
 ## Bug: Some weapons have no muzzleflash in third person.
 
 Only the MP5/9mmAR has a muzzleflash!