The Allow(name) command removes the mark on procedures and modules specified by the Ignore command.  This allows Profile to collect information about the procedure.

Only procedures and modules that were passed to the Ignore command can be given to the Allow command.

a := proc() return "a" end proc;

b := proc() return "b" end proc;

Error, (in CodeTools:-Profiling:-PrintProfiles) a is not currently profiled

b
b := proc()
     |Calls Seconds  Words|
PROC |    1   0.000      0|
   1 |    1   0.000      0| return "b"
end proc

Error, (in CodeTools:-Profiling:-Profile) a is invalid or an ignored procedure

a
a := proc()
     |Calls Seconds  Words|
PROC |    1   0.000      0|
   1 |    1   0.000      0| return "a"
end proc

b
b := proc()
     |Calls Seconds  Words|
PROC |    1   0.000      0|
   1 |    1   0.000      0| return "b"
end proc