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diff --git a/game/server/ai_hull.h b/game/server/ai_hull.h
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+++ b/game/server/ai_hull.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+//=============================================================================//
+
+#ifndef AI_HULL_H
+#define AI_HULL_H
+#pragma once
+
+class Vector;
+//=========================================================
+// Link Properties. These hulls must correspond to the hulls
+// in AI_Hull.cpp!
+//=========================================================
+enum Hull_t
+{
+	HULL_HUMAN,				// Combine, Stalker, Zombie...
+	HULL_SMALL_CENTERED,	// Scanner
+	HULL_WIDE_HUMAN,		// Vortigaunt
+	HULL_TINY,				// Headcrab
+	HULL_WIDE_SHORT,		// Bullsquid
+	HULL_MEDIUM,			// Cremator
+	HULL_TINY_CENTERED,		// Manhack 
+	HULL_LARGE,				// Antlion Guard
+	HULL_LARGE_CENTERED,	// Mortar Synth
+	HULL_MEDIUM_TALL,		// Hunter
+//--------------------------------------------
+	NUM_HULLS,
+	HULL_NONE				// No Hull (appears after num hulls as we don't want to count it)
+};
+
+enum Hull_Bits_t
+{
+	bits_HUMAN_HULL				=	0x00000001,
+	bits_SMALL_CENTERED_HULL	=	0x00000002,
+	bits_WIDE_HUMAN_HULL		=	0x00000004,
+	bits_TINY_HULL				=	0x00000008,
+	bits_WIDE_SHORT_HULL		=	0x00000010,
+	bits_MEDIUM_HULL			=	0x00000020,
+	bits_TINY_CENTERED_HULL		=	0x00000040,
+	bits_LARGE_HULL				=	0x00000080,
+	bits_LARGE_CENTERED_HULL	=	0x00000100,
+	bits_MEDIUM_TALL_HULL		=	0x00000200,
+	bits_HULL_BITS_MASK			=	0x000002ff,
+};
+
+inline int HullToBit( Hull_t hull )
+{
+	return ( 1 << hull );
+}
+
+
+
+//=============================================================================
+//	>> CAI_Hull
+//=============================================================================
+namespace NAI_Hull
+{
+	const Vector &Mins(int id);
+	const Vector &Maxs(int id);
+
+	const Vector &SmallMins(int id);
+	const Vector &SmallMaxs(int id);
+
+	float		Length(int id);
+	float		Width(int id);
+	float		Height(int id);
+
+	int			Bits(int id);
+ 
+	const char*	Name(int id);
+
+	Hull_t		LookupId(const char *szName);
+};
+
+#endif // AI_HULL_H