The WVP of gelatin films were significantly reduced when Ch was added (Table 1), as this decline for the composite film with a 60G:40Ch ratio has been of about 50% (p < 0.05). This could be explained considering that chitosan might enhance the cross-linking of gelatin and decrease the free volume of the polymeric matrix, thus decreasing the diffusion rate of water molecules through the films, resulting in the lower WVP of the films (Cao, Fu, & He, 2007). Kolodziejska & Piotrowska (2007) found decreased WVP of cod skin gelatin based edible films when chitosan was added. These authors represented that neither the gelatin and the chitosan pure films nor the compound ones were significantly different. Similar results were also observed by Pereda et al. (2011) in films based on bovine hide gelatin and chitosan, but there was no statistical difference in WVP between chitosan–gelatin film and gelatin control one.