diff --git a/doc/modules.dox b/doc/modules.dox
new file mode 100644
index 0000000..e69de29
diff --git a/doc/modules_filemanagement.dox b/doc/modules_filemanagement.dox
new file mode 100644
index 0000000..06931aa
--- /dev/null
+++ b/doc/modules_filemanagement.dox
@@ -0,0 +1,19 @@
+/**
+
+@defgroup FileManagement File Management
+
+
+
+
+
+
+@addtogroup FileManagement
+@{
+@fn int ENwriteline (char *line)
+@fn int ENreport ()
+@fn int ENresetreport ()
+@fn int ENsetreport (char *reportFormat)
+@fn int ENopen (char *inpFile, char *rptFile, char *binOutFile)
+@fn int ENsaveinpfile (char *filename)
+@}
+*/
\ No newline at end of file
diff --git a/doc/modules_hydraulicfunctions.dox b/doc/modules_hydraulicfunctions.dox
new file mode 100644
index 0000000..a6abb82
--- /dev/null
+++ b/doc/modules_hydraulicfunctions.dox
@@ -0,0 +1,42 @@
+/**
+
+@defgroup HydraulicFunctions Hydraulic Analysis
+
+~~~~~~~~~~~~~~~{.c}
+int  errcode;
+long t, tstep;
+
+errcode = ENopenH();
+if (!errcode)
+{
+errcode = ENinitH(EN_SAVE);
+if (!errcode) do
+{
+tstep = 0;
+ERRCODE(ENrunH(&t));
+ERRCODE(ENnextH(&tstep));
+}
+while (tstep > 0);
+}
+
+ENcloseH();
+~~~~~~~~~~~~~~~
+
+
+
+@addtogroup HydraulicFunctions
+@{
+
+@fn int ENsolveH()
+@fn int ENsaveH()
+@fn int ENopenH()
+@fn int ENinitH(int initFlag)
+@fn int ENrunH(long *currentTime)
+@fn int ENnextH(long *tStep)
+@fn int ENcloseH()
+@fn int ENsavehydfile(char *filename)
+@fn int ENusehydfile(char *filename)
+@fn int ENgetstatistic(int code, EN_API_FLOAT_TYPE* value)
+
+@}
+*/
diff --git a/doc/modules_networkinfo.dox b/doc/modules_networkinfo.dox
new file mode 100644
index 0000000..5c0bdd6
--- /dev/null
+++ b/doc/modules_networkinfo.dox
@@ -0,0 +1,16 @@
+/**
+
+@defgroup NetworkInfo Network Info
+
+
+@addtogroup NetworkInfo
+@{
+@fn int ENgetcount (int code, int *count) 
+@fn int ENgetnodeindex (char *id, int *index) 
+@fn int ENgetnodeid (int index, char *id) 
+@fn int ENgetnodetype (int index, int *code)
+@fn int ENgetnodevalue (int index, int code, EN_API_FLOAT_TYPE *value)
+@fn int ENgetcoord (int index, EN_API_FLOAT_TYPE *x, EN_API_FLOAT_TYPE *y)
+@fn int ENsetcoord (int index, EN_API_FLOAT_TYPE x, EN_API_FLOAT_TYPE y)
+@}
+*/
\ No newline at end of file
diff --git a/doc/modules_patterns.dox b/doc/modules_patterns.dox
new file mode 100644
index 0000000..996bf22
--- /dev/null
+++ b/doc/modules_patterns.dox
@@ -0,0 +1,14 @@
+/**
+
+@defgroup Patterns
+
+
+@addtogroup Patterns
+@{
+@fn int ENgetpatternindex (char *id, int *index)
+@fn int ENgetpatternid (int index, char *id)
+@fn int ENgetpatternlen (int index, int *len)
+@fn int ENgetpatternvalue (int index, int period, EN_API_FLOAT_TYPE *value)
+@fn int ENgetaveragepatternvalue (int index, EN_API_FLOAT_TYPE *value)
+@}
+*/
diff --git a/doc/modules_qualityfunctions.dox b/doc/modules_qualityfunctions.dox
new file mode 100644
index 0000000..d4a9087
--- /dev/null
+++ b/doc/modules_qualityfunctions.dox
@@ -0,0 +1,17 @@
+/**
+
+@defgroup QualityFunctions Water Quality Functions
+
+
+
+@addtogroup QualityFunctions
+@{
+@fn int ENsolveQ ()
+@fn int ENopenQ ()
+@fn int ENinitQ (int saveFlag)
+@fn int ENrunQ (long *currentTime)
+@fn int ENnextQ (long *tStep)
+@fn int ENstepQ (long *timeLeft)
+@fn int ENcloseQ ()
+@}
+*/
\ No newline at end of file
diff --git a/doc/modules_toolkitoptions.dox b/doc/modules_toolkitoptions.dox
new file mode 100644
index 0000000..e5e798f
--- /dev/null
+++ b/doc/modules_toolkitoptions.dox
@@ -0,0 +1,14 @@
+/**
+
+@defgroup ToolkitOptions Toolkit Options
+
+
+@addtogroup ToolkitOptions
+@{
+@fn int ENgetoption (int code, EN_API_FLOAT_TYPE *value)
+@fn int ENgettimeparam (int code, long *value)
+@fn int ENgetflowunits (int *code)
+@fn int ENgetqualtype (int *qualcode, int *tracenode)
+@fn int ENgeterror (int errcode, char *errmsg, int maxLen)
+@}
+*/
\ No newline at end of file