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Ex

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| 1. | The Option Period shall be extended for a further period of thirty (30) days expiring on 9th August 2006. |
|----|-----------------------------------------------------------------------------------------------------------|

| 2. | Except as specifically amended by this Agreement, the PA shall remain unchanged. The Parties hereby affirm and ratify the PA as amended by this Agreement. |
|----|------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ERHC Energy, Inc.                       |                                  |
|-----------------------------------------|---------------------------------------|
|                                    |                                  |   |
|                                    |                                  |   |
|                                    | /s/ Walter F Brandhuber               |   |
|                                    | Walter F Brandhuber                   |   |
|                                    | President and Chief Executive Officer |   |
|                                    |                                  |   |
|                                    |                                  |   |
| ERHC Energy Nigeria JDZ Block 4 Limited |                                  |
|                                    |                                  |   |
|                                    |                                  |   |
| By:                                     |                                  | /s/ Walter F Brandhuber |   |
|                                    |                                  |   |
|                                    | Walter F Brandhuber                   |   |
|                                    | President and Chief Executive Officer |   |
|                                    |                                  |   |
|                                    |                                  |   |
| Addax Petroleum JDZ 4 Limited           |                                  |
|                                    |                                  |   |
|                                    |                                  |   |
| By:                                     |                                  | /s/ David Codd |   |
|                                    | David Codd                            |   |
|                                    | Authorised signatory                  |   |
|                                    |                                  |   |
|                                    |                                  |   |
| For and on behalf of                    |                                  |
| Addax Petroleum NV                      |                                  |
|                                    |                                  |   |
|                                    |                                  |   |
| By:                                     |                                  | /s/ David Codd |   |
|                                    | David Codd                            |   |
| Authorised Signatory                    |                                  |

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