diff --git a/godoc.md b/godoc.md
index ae64511..d61ff77 100644
--- a/godoc.md
+++ b/godoc.md
@@ -12,6 +12,7 @@ Package tagcmp provides image tag comparison operations\.
 
 - [Variables](<#variables>)
 - [func IsParsable(tag string) bool](<#func-isparsable>)
+- [func UpgradeType(t Tag) int](<#func-upgradetype>)
 - [type ByTagAsc](<#type-bytagasc>)
   - [func (t ByTagAsc) Len() int](<#func-bytagasc-len>)
   - [func (t ByTagAsc) Less(i, j int) bool](<#func-bytagasc-less>)
@@ -27,6 +28,7 @@ Package tagcmp provides image tag comparison operations\.
   - [func (t Tag) IsGreaterThan(tag Tag) bool](<#func-tag-isgreaterthan>)
   - [func (t Tag) IsLessThan(tag Tag) bool](<#func-tag-islessthan>)
   - [func (t Tag) String() string](<#func-tag-string>)
+  - [func (curTag Tag) UpgradeElement(newTag Tag) (Tag, error)](<#func-tag-upgradeelement>)
 
 
 ## Variables
@@ -69,6 +71,14 @@ func IsParsable(tag string) bool
 
 IsParsable determines if a tag is supported by this library
 
+## func UpgradeType
+
+```go
+func UpgradeType(t Tag) int
+```
+
+UpgradeType takes exit from UpgradeElemene and returns a numeric representation of upgrade or downgrade 1/\-1: patch 2/\-2: minor 4/\-4: major 0: no change
+
 ## type ByTagAsc
 
 ByTagAsc sorts tags in ascending order where the last element is the latest tag\.
@@ -183,6 +193,14 @@ func (t Tag) String() string
 
 String formats a Tag correctly in string representation
 
+### func \(Tag\) UpgradeElement
+
+```go
+func (curTag Tag) UpgradeElement(newTag Tag) (Tag, error)
+```
+
+UpgradeElement returns a Tag object which is the difference between an old and new tag It can contain negative numbers if comparing with an older tag\.
+
 
 
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