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diff --git a/src/detect-flowint.h b/src/detect-flowint.h
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+++ b/src/detect-flowint.h
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+/* Copyright (C) 2007-2014 Open Information Security Foundation
+ *
+ * You can copy, redistribute or modify this Program under the terms of
+ * the GNU General Public License version 2 as published by the Free
+ * Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+/**
+ * \file
+ *
+ * \author Pablo Rincon <pablo.rincon.crespo@gmail.com>
+ */
+
+#ifndef __DETECT_FLOWINT_H__
+#define __DETECT_FLOWINT_H__
+
+/** Flowint operations allowed */
+enum {
+    /** Changing integer values */
+    FLOWINT_MODIFIER_SET,
+    FLOWINT_MODIFIER_ADD,
+    FLOWINT_MODIFIER_SUB,
+
+    /** Comparing integer values */
+    FLOWINT_MODIFIER_LT,
+    FLOWINT_MODIFIER_LE,
+    FLOWINT_MODIFIER_EQ,
+    FLOWINT_MODIFIER_NE,
+    FLOWINT_MODIFIER_GE,
+    FLOWINT_MODIFIER_GT,
+    /** Checking if a var is set (keyword isset/notset)*/
+    FLOWINT_MODIFIER_ISSET,
+    FLOWINT_MODIFIER_NOTSET,
+
+    FLOWINT_MODIFIER_UNKNOWN
+};
+
+/** The target can be a value, or another variable already declared */
+enum {
+    FLOWINT_TARGET_VAL,
+    FLOWINT_TARGET_VAR,
+    FLOWINT_TARGET_SELF,
+};
+
+/** If the target is another var, get the name and the idx */
+typedef struct TargetVar_ {
+    char *name;
+} TargetVar;
+
+/** Context data for flowint vars */
+typedef struct DetectFlowintData_ {
+    /* This is the main var we are going to use
+    * against the target */
+    char *name;
+    /* Internal id of the var */
+    uint32_t idx;
+
+    /* The modifier/operation/condition we are
+    * going to execute */
+    uint8_t modifier;
+    uint8_t targettype;
+
+    union {
+        /* the target value */
+        uint32_t value;
+        /* or the target var */
+        TargetVar tvar;
+    } target;
+} DetectFlowintData;
+
+/* prototypes */
+void DetectFlowintRegister (void);
+
+#endif /* __DETECT_FLOWINT_H__ */
+