README.md in danica-2.0.4 vs README.md in danica-2.0.5

@@ -39,16 +39,16 @@
     #optionaly implement custom to_gnu method
   end
 
   private
 
-  def tex_string
-    #implement tex_string here
+  def to_tex
+    #implement to_tex here
   end
 
-  def gnu_string
-    #implement gnu_string here
+  def to_gnu
+    #implement to_gnu here
   end
 end
 ```
 #### Sample
 ```ruby
@@ -59,14 +59,14 @@
     value.to_f ** -1 #Do not worry with nil value as this has been implemented already raising Danica::Exception::NotDefined
   end
 
   private
 
-  def tex_string
+  def to_tex
     "(#{value.to_tex})^{-1}"
   end
 
-  def gnu_string
+  def to_gnu
     "(#{value.to_gnu}) ** -1"
   end
 end
 
 fx = Danica::Inverse.new(:x)