diff --git a/l4d2_linux.h b/l4d2_linux.h
index 1217ea2..afa1b37 100644
--- a/l4d2_linux.h
+++ b/l4d2_linux.h
@@ -16,5 +16,6 @@
 #include "Activity_enum.h"
 #include "baseclient.h"
 #include "terror_bots.h"
+#include "zombie_manager.h"
 
 #endif
diff --git a/l4d2_windows.h b/l4d2_windows.h
index ee771b7..8c706c8 100644
--- a/l4d2_windows.h
+++ b/l4d2_windows.h
@@ -13,5 +13,6 @@
 #include "gamerules.h"
 #include "abilities.h"
 #include "activity_enum.h"
+#include "zombie_manager.h"
 
 #endif
diff --git a/zombie_manager.h b/zombie_manager.h
new file mode 100644
index 0000000..3fe13d0
--- /dev/null
+++ b/zombie_manager.h
@@ -0,0 +1,55 @@
+#ifndef _INCLUDE_ZOMBIE_MANAGER_H_
+#define _INCLUDE_ZOMBIE_MANAGER_H_
+
+#include "timers.h"
+
+enum PreferredMobDirection
+{
+    SPAWN_NO_PREFERENCE = -1,
+    SPAWN_ANYWHERE = 0,
+    SPAWN_BEHIND_SURVIVORS = 1,
+    SPAWN_NEAR_IT_VICTIM = 2,
+    SPAWN_FAR_AWAY_FROM_SURVIVORS = 5,
+    SPAWN_ABOVE_SURVIVORS = 6,
+    SPAWN_IN_FRONT_OF_SURVIVORS = 7,
+    SPAWN_LARGE_VOLUME = 9
+};
+
+struct ZombieManager_UnknownStruct // 0x14, I guess it can be NavArea or CTerrorNavArea
+{
+    int m_iUnknown[5];
+};
+
+struct ZombieManager
+{
+    void *vptr; // 0x0, virtual destructor only
+    bool unknown[4]; // 0x4, first two bytes are used 
+    int m_nFallenSurvivors; // 0x8
+    CountdownTimer m_FallenSurvivorTimer; // 0xC - 0x14
+    bool m_bJimmyTimerExpired; // 0x18
+    CountdownTimer m_JimmyTimer; // 0x1C - 0x24
+    char unknown40[4]; // 0x28
+    int m_iUnknown44; // 0x2C
+    CountdownTimer m_MegaMobTimer; // 0x30 - 0x38
+    char unknown60[52]; // 0x3C - 0x6C
+    ZombieManager_UnknownStruct m_unknownStruct[11]; // 0x70 - 0x138
+    CountdownTimer m_unknownTimer332[11]; // 0x14C - 0x1C4
+    int m_iUnknown464[10]; // 0x1D0 - 0x1F4
+    CountdownTimer m_unknownTimer504; // 0x1F8 - 0x200
+    CountdownTimer m_unknownTimer516; // 0x204 - 0x20C
+    int m_nPendingMobCount; // 0x210
+    PreferredMobDirection m_PreferredMobDirection; // 0x214
+    int m_PreferredMobPosition; // 0x218
+    int m_PreferredMobPositionRange; // 0x21C
+    int m_iUnknown544; // 0x220
+    int m_iUnknown548; // 0x224
+    CountdownTimer m_unknownTimer552; // 0x228 - 0x230
+    int m_nAmbientMobCount; // 0x234
+    int m_nAmbientMobUnknown; // 0x238
+    int m_iUnknown572[16]; // 0x23C - 0x278
+    char unknown636[12]; // 0x27C
+    char unknown648[4]; // 0x288
+    int m_iUnknown652; // 0x28C
+};
+
+#endif