diff --git a/models/repo.go b/models/repo.go
index 20671cb019..b3e08a93e8 100644
--- a/models/repo.go
+++ b/models/repo.go
@@ -224,7 +224,7 @@ func (repo *Repository) AfterSet(colName string, _ xorm.Cell) {
 		repo.NumOpenMilestones = repo.NumMilestones - repo.NumClosedMilestones
 	case "external_tracker_style":
 		if len(repo.ExternalTrackerStyle) == 0 {
-			repo.ExternalTrackerStyle = markdown.ISSUE_NAME_STYLE_NUMERIC
+			repo.ExternalTrackerStyle = markdown.IssueNameStyleNumeric
 		}
 	case "created_unix":
 		repo.Created = time.Unix(repo.CreatedUnix, 0).Local()
@@ -310,10 +310,10 @@ func (repo *Repository) ComposeMetas() map[string]string {
 			"repo":   repo.Name,
 		}
 		switch repo.ExternalTrackerStyle {
-		case markdown.ISSUE_NAME_STYLE_ALPHANUMERIC:
-			repo.ExternalMetas["style"] = markdown.ISSUE_NAME_STYLE_ALPHANUMERIC
+		case markdown.IssueNameStyleAlphanumeric:
+			repo.ExternalMetas["style"] = markdown.IssueNameStyleAlphanumeric
 		default:
-			repo.ExternalMetas["style"] = markdown.ISSUE_NAME_STYLE_NUMERIC
+			repo.ExternalMetas["style"] = markdown.IssueNameStyleNumeric
 		}
 
 	}
diff --git a/modules/markdown/markdown.go b/modules/markdown/markdown.go
index 58bb8f417f..e46f172d3e 100644
--- a/modules/markdown/markdown.go
+++ b/modules/markdown/markdown.go
@@ -22,11 +22,13 @@ import (
 	"code.gitea.io/gitea/modules/setting"
 )
 
+// Issue name styles
 const (
-	ISSUE_NAME_STYLE_NUMERIC      = "numeric"
-	ISSUE_NAME_STYLE_ALPHANUMERIC = "alphanumeric"
+	IssueNameStyleNumeric      = "numeric"
+	IssueNameStyleAlphanumeric = "alphanumeric"
 )
 
+// Sanitizer markdown sanitizer
 var Sanitizer = bluemonday.UGCPolicy()
 
 // BuildSanitizer initializes sanitizer with allowed attributes based on settings.
@@ -163,7 +165,7 @@ func (r *Renderer) AutoLink(out *bytes.Buffer, link []byte, kind int) {
 }
 
 // ListItem defines how list items should be processed to produce corresponding HTML elements.
-func (options *Renderer) ListItem(out *bytes.Buffer, text []byte, flags int) {
+func (r *Renderer) ListItem(out *bytes.Buffer, text []byte, flags int) {
 	// Detect procedures to draw checkboxes.
 	switch {
 	case bytes.HasPrefix(text, []byte("[ ] ")):
@@ -171,7 +173,7 @@ func (options *Renderer) ListItem(out *bytes.Buffer, text []byte, flags int) {
 	case bytes.HasPrefix(text, []byte("[x] ")):
 		text = append([]byte(`<input type="checkbox" disabled="" checked="" />`), text[3:]...)
 	}
-	options.Renderer.ListItem(out, text, flags)
+	r.Renderer.ListItem(out, text, flags)
 }
 
 // Note: this section is for purpose of increase performance and
@@ -235,7 +237,7 @@ func RenderIssueIndexPattern(rawBytes []byte, urlPrefix string, metas map[string
 	urlPrefix = cutoutVerbosePrefix(urlPrefix)
 
 	pattern := IssueNumericPattern
-	if metas["style"] == ISSUE_NAME_STYLE_ALPHANUMERIC {
+	if metas["style"] == IssueNameStyleAlphanumeric {
 		pattern = IssueAlphanumericPattern
 	}
 
@@ -249,7 +251,7 @@ func RenderIssueIndexPattern(rawBytes []byte, urlPrefix string, metas map[string
 			link = fmt.Sprintf(`<a href="%s/issues/%s">%s</a>`, urlPrefix, m[1:], m)
 		} else {
 			// Support for external issue tracker
-			if metas["style"] == ISSUE_NAME_STYLE_ALPHANUMERIC {
+			if metas["style"] == IssueNameStyleAlphanumeric {
 				metas["index"] = string(m)
 			} else {
 				metas["index"] = string(m[1:])
@@ -322,10 +324,10 @@ var noEndTags = []string{"img", "input", "br", "hr"}
 
 // PostProcess treats different types of HTML differently,
 // and only renders special links for plain text blocks.
-func PostProcess(rawHtml []byte, urlPrefix string, metas map[string]string) []byte {
+func PostProcess(rawHTML []byte, urlPrefix string, metas map[string]string) []byte {
 	startTags := make([]string, 0, 5)
 	var buf bytes.Buffer
-	tokenizer := html.NewTokenizer(bytes.NewReader(rawHtml))
+	tokenizer := html.NewTokenizer(bytes.NewReader(rawHTML))
 
 OUTER_LOOP:
 	for html.ErrorToken != tokenizer.Next() {
@@ -387,7 +389,7 @@ OUTER_LOOP:
 
 	// If we are not at the end of the input, then some other parsing error has occurred,
 	// so return the input verbatim.
-	return rawHtml
+	return rawHTML
 }
 
 // Render renders Markdown to HTML with special links.