Cisco Application :: Set Max-parse-length 8192 On ACE

I would like to know the meaning of 'set max-parse-length 8192' on ACE.Looking at Cisco documentation I found:"you can set the maximum number of bytes to parse for generic protocols by using the set max-parse-length command in generic parameter-map configuration mode.You can set the maximum number of bytes to parse for generic protocols by using the set max-parse-length command in generic parameter-map configuration mode.' what a set max-parse-lenght is?