A blade for a wind turbine comprising a primary blade module and a secondary blade module; wherein the primary blade module comprises: a first blade shell having a root end and a first coupling end configured to be coupled with the secondary blade module; two opposed spar caps with respective first spar cap portions extending along the first blade shell substantially from the root end to the first coupling end of the first blade shell, and respective second spar cap portions extending beyond the first coupling end of the first blade shell; two first shear webs extending between the opposed spar caps at least partially along the respective first spar cap portions; wherein the secondary blade module comprises: a second blade shell having a second coupling end and a tip end, and defining a hollow interior, the second coupling end being configured to be coupled with the primary blade module in such a way that, in use, at least part of the spar caps of the primary blade module extend at least partially along the second blade shell; wherein the first coupling end of the primary blade module and the second coupling end of the secondary blade module are configured to be coupled to each other in such a way that, in use, the blade is formed with the second spar cap portions of the primary blade module extending at least partially along the second blade shell of the secondary blade module; characterised by the blade further comprising a second shear web configured to be arranged in such a way that, in use, said second shear web extends along the second spar cap portions and partially along the first spar cap portions, so that an overlap is caused between part of the first shear webs and part of the second shear web. a first blade shell having a root end and a first coupling end configured to be coupled with the secondary blade module; two opposed spar caps with respective first spar cap portions extending along the first blade shell substantially from the root end to the first coupling end of the first blade shell, and respective second spar cap portions extending beyond the first coupling end of the first blade shell; two first shear webs extending between the opposed spar caps at least partially along the respective first spar cap portions; wherein the secondary blade module comprises: a second blade shell having a second coupling end and a tip end, and defining a hollow interior, the second coupling end being configured to be coupled with the primary blade module in such a way that, in use, at least part of the spar caps of the primary blade module extend at least partially along the second blade shell; wherein the first coupling end of the primary blade module and the second coupling end of the secondary blade module are configured to be coupled to each other in such a way that, in use, the blade is formed with the second spar cap portions of the primary blade module extending at least partially along the second blade shell of the secondary blade module; characterised by the blade further comprising a second shear web configured to be arranged in such a way that, in use, said second shear web extends along the second spar cap portions and partially along the first spar cap portions, so that an overlap is caused between part of the first shear webs and part of the second shear web. a second blade shell having a second coupling end and a tip end, and defining a hollow interior, the second coupling end being configured to be coupled with the primary blade module in such a way that, in use, at least part of the spar caps of the primary blade module extend at least partially along the second blade shell; wherein the first coupling end of the primary blade module and the second coupling end of the secondary blade module are configured to be coupled to each other in such a way that, in use, the blade is formed with the second spar cap portions of the primary blade module extending at least partially along the second blade shell of the secondary blade module; characterised by the blade further comprising a second shear web configured to be arranged in such a way that, in use, said second shear web extends along the second spar cap portions and partially along the first spar cap portions, so that an overlap is caused between part of the first shear webs and part of the second shear web.