Three experiments were conducted to examine the relative effectiveness of two types of text signals on readers' recall of chapter content: “preview” sentences and “recall” sentences. Preview sentences signal contents in upcoming chapters, while recall sentences are backward signals that signal back to previously read material. The results of three experiments indicated that preview and recall sentences each significantly increase readers' recall of signal-relevant content but at the expense of memory for unsignaled information. In combination, preview and recall sentences have significantly more powerful signaling effect than either alone. The results generalized across different types of materials and subjects.