diff --git a/src/text/template/template.go b/src/text/template/template.go
index 2c5ff013e39b73..e0c096207c79cb 100644
--- a/src/text/template/template.go
+++ b/src/text/template/template.go
@@ -119,12 +119,12 @@ func (t *Template) copy(c *common) *Template {
 	}
 }
 
-// AddParseTree adds parse tree for template with given name and associates it with t.
-// If the template does not already exist, it will create a new one.
-// If the template does exist, it will be replaced.
+// AddParseTree associates the argument parse tree with the template t, giving
+// it the specified name. If the template has not been defined, this tree becomes
+// its definition. If it has been defined and already has that name, the existing
+// definition is replaced; otherwise a new template is created, defined, and returned.
 func (t *Template) AddParseTree(name string, tree *parse.Tree) (*Template, error) {
 	t.init()
-	// If the name is the name of this template, overwrite this template.
 	nt := t
 	if name != t.name {
 		nt = t.New(name)