Django admin site not displaying ManyToManyField relationship

class Tech(models.Model):
    name = models.CharField(max_length = 30)

class Project(models.Model):
    title = models.CharField(max_length = 50)
    techs = models.ManyToManyField(Tech)

class TechInline(admin.TabularInline):
    model = Tech
    extra = 5

class ProjectAdmin(admin.ModelAdmin):
    fields = ['title']
    inlines = []
    list_display = ('title')

admin.site.register(Project, ProjectAdmin)

<class 'home.projects.models.Tech'> has no ForeignKey to <class 'home.projects.models.Project'>

python manage.py sqlreset <myapp>