Nintendo is adding content warnings to Wii Karaoke U after reports began circulating last week that the title does not censor mature lyrics, reports Eurogamer.

Last week NintendoLife and Reddit users posted screenshots of the game, which shows some racier songs have kept their explicit lyrics intact despite the title's intentions to be family-friendly. In Wii Karaoke U, players use their Wii avatar to sing along to songs. The bank of tracks numbers in the hundreds and is drawn from developer Joysound's database.

In a statement to Eurogamer, a representative for Nintendo said a warning will be added to Wii Karaoke U's eShop page as well as in the app itself. The warning will be displayed prior to downloading the game and during its startup.

"Wii Karaoke U by Joysound is intended to provide users with access to a large catalogue of songs from a broad range of music labels across a variety of musical genres — designed to appeal to all music tastes," reads the statement from Nintendo. "As such Nintendo does not restrict which songs are included in the catalogue of songs featured within the Wii Karaoke U by Joysound application.

"We are aware that some songs contain explicit lyrics and deal with adult themes which some audiences may find unsuitable," the statement continues. "As such the Wii Karaoke U by Joysound application currently includes a notice which informs users that music downloads are not rated by PEGI.

"It is however very important to us that all users of Wii Karaoke U by Joysound understand that some lyrics contained within songs may not be suitable for all audiences and as such we will immediately be implementing an additional message within the Nintendo eShop (prior to downloading the application and ticket purchase) as well as on the Wii Karaoke U by Joysound website pages. In the near future this message will also be incorporated within the notification that is displayed as the Wii Karaoke U by Joysound application is launched."