Here is a quote from Stuart Isacoff previously an editor of "Sheet Music Magazine."

Chord Voicing, Pt. 3; Spaced-Out Sounds

"These sound are very jazzy, and will not be appropriate for use in all the music you play. But it's interesting to see how they're built and it's good to have these voicings to add to your pallette of harmonic colors."

"Chords which are suspended or have 11ths (the 4th and 11th are the same note, an octave apart), do not contain the major third...." (emphasis his)