By adding another 3rd interval on top of a 9th chord, it is possible to create an 11th chord. Depending on the 3rd and 7th of the chord, you can create major, minor and dominant 11th chords. The chord shown below is a C minor 11th (Cm11). By raising the 3rd of the chord from Eb to E@ it could be changed to a dominant 11th chord (C11). By raising the 3rd and the 7th it could be changed to a major 11th (CMaj11 ).