diff --git a/public/tier0/icommandline.h b/public/tier0/icommandline.h
index 64d2e800..e9255372 100644
--- a/public/tier0/icommandline.h
+++ b/public/tier0/icommandline.h
@@ -25,6 +25,7 @@ public:
 
 	// Check whether a particular parameter exists
 	virtual	const char	*CheckParm( const char *psz, const char **ppszValue = 0 ) const = 0;
+	virtual bool		HasParm( const char *parm ) const = 0;
 	virtual void		RemoveParm( const char *parm ) = 0;
 	virtual void		AppendParm( const char *pszParm, const char *pszValues ) = 0;