A quick note on Cap Gaps...
For those that aren't aware, a Cap Gap is is the period between the end of an F-1 student's status and the start of their H-1B (work visa) status. It can occur when an F-1 student graduates (or their OPT ends) before their H-1B goes into effect on October 1.
As long as the F-1 student is still in their program (or doing OPT) before their employer files for H1B, and the employer files on time, then the student is automatically granted a Cap Gap extension.
The Cap Gap extends the student's legal status and work authorization until the H1B goes into effect on 10/1, and it should be reflected on the I-20.
IF IT"S NOT ON THE I-20...
You can contact your DSO and ask them to submit a 'Data Fix' to have it added.
You will need to provide them with a copy of your I-797 that proves your H1B application has been submitted.
This request will then be processed by SEVP. Processing times can vary, but once the DSO submits the request a new I-20 should generally be available in 1-2 weeks.
Best of luck to everyone applying for an H1B this year!