diff --git a/modules/structs/repo.go b/modules/structs/repo.go
index 90ac1688e4..47973a5f6a 100644
--- a/modules/structs/repo.go
+++ b/modules/structs/repo.go
@@ -223,7 +223,7 @@ type EditRepoOption struct {
 	DefaultAllowMaintainerEdit *bool `json:"default_allow_maintainer_edit,omitempty"`
 	// set to `true` to archive this repository.
 	Archived *bool `json:"archived,omitempty"`
-	// set a string like `8h30m0s` to set the mirror interval time
+	// set to a string like `8h30m0s` to set the mirror interval time
 	MirrorInterval *string `json:"mirror_interval,omitempty"`
 	// enable prune - remove obsolete remote-tracking references when mirroring
 	EnablePrune *bool `json:"enable_prune,omitempty"`
diff --git a/templates/swagger/v1_json.tmpl b/templates/swagger/v1_json.tmpl
index 7cd9d9355d..6ed21e0451 100644
--- a/templates/swagger/v1_json.tmpl
+++ b/templates/swagger/v1_json.tmpl
@@ -24799,7 +24799,7 @@
           "$ref": "#/definitions/InternalTracker"
         },
         "mirror_interval": {
-          "description": "set a string like `8h30m0s` to set the mirror interval time",
+          "description": "set to a string like `8h30m0s` to set the mirror interval time",
           "type": "string",
           "x-go-name": "MirrorInterval"
         },