In Doctrine 2.3 the 'add' and 'remove' methods in oneToMany associations have another problem (in earlier versions like 2.2 this worked correct). The singular form is not correctly detected if the property ends with 'ies' like 'entries' which should be transformed to 'entry'.
I have this YAML definition:

Archive:
  type: entity
  fields:
    id:
      id: true
      type: integer
      unsigned: false
      nullable: false
      generator:
        strategy: IDENTITY
  oneToMany:
    entries:
      targetEntity: Entry
      mappedBy: archive

This generates these methods:

public function addEntrie(\Entry $entries) { ... }
public function removeEntrie(\Entry $entries) { ... }

Because in the EntityGenerator only the plural 's' is removed. It would be nice if an ending of 'ies' could be replaced by 'y'. So that we get these methods

public function addEntry(\Entry $entries) { ... }
public function removeEntry(\Entry $entries) { ... }

My fork already has the changes https://github.com/naitsirch/doctrine-orm2/commit/a3adfccb4927d61da7debae46ed0fff61e4212f8
I have opened a pull request here https://github.com/doctrine/doctrine2/pull/530