diff --git a/tests/Etc/Comment.php b/tests/Etc/Comment.php
index 27284e2f..691e82e0 100644
--- a/tests/Etc/Comment.php
+++ b/tests/Etc/Comment.php
@@ -3,6 +3,7 @@
 namespace Stancl\Tenancy\Tests\Etc;
 
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
 class Comment extends Model
 {
@@ -10,7 +11,7 @@ class Comment extends Model
 
     public $timestamps = false;
 
-    public function post()
+    public function post(): BelongsTo
     {
         return $this->belongsTo(Post::class);
     }
diff --git a/tests/Etc/Post.php b/tests/Etc/Post.php
index 94c70fbf..d73ed731 100644
--- a/tests/Etc/Post.php
+++ b/tests/Etc/Post.php
@@ -3,8 +3,12 @@
 namespace Stancl\Tenancy\Tests\Etc;
 
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 use Stancl\Tenancy\Database\Concerns\BelongsToTenant;
 
+/**
+ * This model is intended to be used with the single-database tenancy approach.
+ */
 class Post extends Model
 {
     use BelongsToTenant;
@@ -13,12 +17,12 @@ class Post extends Model
 
     public $timestamps = false;
 
-    public function comments()
+    public function comments(): HasMany
     {
         return $this->hasMany(Comment::class);
     }
 
-    public function scoped_comments()
+    public function scoped_comments(): HasMany
     {
         return $this->hasMany(Comment::class);
     }
diff --git a/tests/Etc/ScopedComment.php b/tests/Etc/ScopedComment.php
index 733d1ea9..90b4f4dd 100644
--- a/tests/Etc/ScopedComment.php
+++ b/tests/Etc/ScopedComment.php
@@ -4,6 +4,9 @@ namespace Stancl\Tenancy\Tests\Etc;
 
 use Stancl\Tenancy\Database\Concerns\BelongsToPrimaryModel;
 
+/**
+ * This model is intended to be used with the single-database tenancy approach.
+ */
 class ScopedComment extends Comment
 {
     use BelongsToPrimaryModel;