diff --git a/render.py b/render.py
index 995f430..a93112f 100644
--- a/render.py
+++ b/render.py
@@ -15,7 +15,7 @@ class Render(object):
     Those three dictionnaries while define how a postfix expression will be transform into a string.
     """
 
-    PRIORITY = {"*" : 3, "/": 3, "+": 2, "-":2, "(": 1}
+    PRIORITY = {"*" : 3, "/": 3, ":": 3, "+": 2, "-":2, "(": 1}
 
     def __init__(self, op_infix = {}, op_postfix = {}, other = {}, join = " ", type_render = {int: str, Fraction: str, FormalExp: str}):
         """Initiate the render
@@ -204,7 +204,7 @@ class flist(list):
 # ------------------------
 # A console render
 
-txt_infix = {"+": "+", "-": "-", "*": "*", "/" : "/"}
+txt_infix = {"+": "+", "-": "-", "*": "*", "/" : "/", ":": ":"}
 txt_postfix = {}
 txt_other = {"(": "(", ")": ")"}
 
@@ -213,7 +213,7 @@ txt_render = Render(txt_infix, txt_postfix, txt_other)
 # ------------------------
 # A infix to postfix list convertor
 
-p2i_infix = {"+": "+", "-": "-", "*": "*", "/" : "/"}
+p2i_infix = {"+": "+", "-": "-", "*": "*", "/" : "/", ":":":"}
 p2i_postfix = {}
 p2i_other = {"(": "(", ")": ")"}
 
@@ -232,7 +232,7 @@ def texSlash(op1, op2):
 def texFrac(frac):
     return ["\\frac{" , str(frac._num) , "}{" , str(frac._denom) , "}"]
 
-tex_infix = {"+": " + ", "-": " - ", "*": " \\times "}
+tex_infix = {"+": " + ", "-": " - ", "*": " \\times ", ":": ":"}
 tex_postfix = {"/": texSlash}
 tex_other = {"(": "(", ")": ")"}
 tex_type_render = {int: str, Fraction: texFrac, FormalExp: str}
@@ -242,9 +242,9 @@ tex_render = Render(tex_infix, tex_postfix, tex_other, type_render = tex_type_re
 
 
 if __name__ == '__main__':
-    exp = [2, 5, '+', 1, '-', 3, 4, '*', '/']
+    exp = [2, 5, '+', 1, '-', 3, 4, '*', ':']
     print(txt_render(exp))
-    exp = [2, 5, '+', 1, '-', 3, 4, '*', '/', 3, '+']
+    exp = [2, 5, '+', 1, '-', 3, 4, '*', '/', 3, 5, '/', ':']
     print(tex_render(exp))
     exp = [2, 5, '+', 1, '-', 3, 4, '*', '/', 3, '+']
     print(post2in_fix(exp))