Online annotations are often characterized as improving three levels of comprehension: surface-based, text-based, and situation-based (Tseng et al., 2015). Surface-based comprehension meansthe students have sufficient grammatical knowledge and vocabulary to decode the meaning ofthe text. Text-based comprehension is a layer deeper and occurs when students cannot onlydecode the text, but can reproduce the essential information from the text. Finally, in thesituation-based comprehension level students can situate the textual information in otherknowledge and integrate it in a coherent manner (Tseng et al., 2015).