unix sort according to a header line

Hi,

I have a file with a header line, followed by some contents. How can I sort the file according to header lines?

eg.
/* abcd_005*/
a
bc
/* abcd_001*/
d
e
/* abcd_002*/
x
y

desired output:

/*abcd_001*/
d
e
/*abcd_002*/
x
y
/*abcd_005*/
a
bc