The conclusion of a king's reign often leaves many untold stories behind. As the account of Rehoboam's time on the throne comes to a close, a broader historical record is acknowledged. All of his actions and deeds throughout his time as king [ביאור שטיינזלץ] are documented in an external historical source. While many other events undoubtedly took place during his rule, they are left out of the present account because they do not serve the central purpose of the biblical narrative.
Instead, these details were recorded in a comprehensive historical collection that gathered the histories of all the kings of Judah. Directing the reader to a general book, rather than an individual one, highlights a striking contrast between the rulers. While the life events of Rehoboam and the other kings were compiled together into a single shared volume, King Solomon was given a dedicated historical book entirely his own. This distinction points to Solomon's immense greatness, suggesting that his stature was equal to that of all the other kings of Judah combined [אברבנאל].