A Married Filing Joint tax return reports all income and deductions for both people listed on the return. So, your husband's business income should have been included since you filed a joint return.
The question is whether his LLC is a sole-proprietorship or a different kind of business entity that is required to file its own tax return. If it is a sole proprietorship, then it should have been included on the joint return by filing Schedule C for his business income and expenses. If he file a separate business return, such as Form 1065 or Form 1120-S, then those tax returns would generate a K-1 reporting his personal share of the business income. That K-1 should have been included as part of the joint return.
Either way, your Married Filing Joint tax return will need to be amended to include your husband's business income, either by adding a Schedule C or a K-1 for his income.
Or you could both choose to file Married Filing Separate tax returns to keep things separated. Doing this will also require an amended return to be filed before the tax deadline of April 15.
@Kar1992
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