diff --git a/pEpACIDgen/acid_yml.py b/pEpACIDgen/acid_yml.py
index 6021bf9..9568879 100644
--- a/pEpACIDgen/acid_yml.py
+++ b/pEpACIDgen/acid_yml.py
@@ -17,8 +17,7 @@ def generate_acid_yml(acid, module_name):
 
 
 def _grammar_header():
-    grammar = """
-decl module @name;
+    grammar = """decl module @name;
 decl method @name;
 
 decl struct @name;
@@ -36,6 +35,7 @@ def _generate_functions(acid):
 
     # Main
     tmpl_main = 'method {name} {{\n'
+    tmpl_main += '    method sig="{sig}";\n'
     tmpl_main += '    return type="{return_type}";\n'
     tmpl_main += '{subitems}'
     tmpl_main += '}};\n\n'
@@ -61,7 +61,18 @@ def _generate_functions(acid):
         for subitem in subitems:
             subitems_str += tmpl_sub.format(type=subitem["type"], name=subitem["name"]) + "\n"
 
-        ret += tmpl_main.format(name=item["name"], return_type=item["result_type"], subitems=subitems_str)
+        # (PEP_STATUS(*)(void*,const char*,const char*,const char*,const char*,const char*))
+        sig_ret = item["result_type"] + "(*)"
+        sig_parms = ""
+
+        for subitem in subitems:
+            sig_parms += subitem["type"] + ", "
+
+        sig_parms = sig_parms[:-2]
+
+        sig_str = "(" + sig_ret + "(" +sig_parms + "))"
+
+        ret += tmpl_main.format(name=item["name"], return_type=item["result_type"], sig=sig_str, subitems=subitems_str)
 
     return ret