diff --git a/Source/objects.cpp b/Source/objects.cpp
index c261ee7f3..4889fd7f8 100644
--- a/Source/objects.cpp
+++ b/Source/objects.cpp
@@ -3997,6 +3997,17 @@ void OperateWeaponRack(int pnum, int i, bool sendmsg)
 		NetSendCmdParam1(false, CMD_OPERATEOBJ, i);
 }
 
+/**
+ * @brief Checks whether the player is activating Na-Krul's spell tomes in the correct order
+ *
+ * Used as part of the final Diablo: Hellfire quest (from the hints provided to the player in the
+ * reconstructed note). This function both updates the state of the variable that tracks progress
+ * and also determines whether the spawn conditions are met (i.e. all tomes have been triggered
+ * in the correct order).
+ *
+ * @param s the id of the spell tome
+ * @return true if the player has activated all three tomes in the correct order, false otherwise
+ */
 bool OperateNakrulBook(int s)
 {
 	switch (s) {
diff --git a/Source/objects.h b/Source/objects.h
index 9a193fc35..97a62ca18 100644
--- a/Source/objects.h
+++ b/Source/objects.h
@@ -168,18 +168,6 @@ void GetObjectStr(int i);
 void OperateNakrulLever();
 void SyncNakrulRoom();
 void AddNakrulLeaver();
-/**
- * @brief Checks whether the player is activating Na-Krul's spell tomes in the correct order
- *
- * Used as part of the final Diablo: Hellfire quest (from the hints provided to the player in the
- * reconstructed note). This function both updates the state of the variable that tracks progress
- * and also determines whether the spawn conditions are met (i.e. all tomes have been triggered
- * in the correct order).
- *
- * @param s the id of the spell tome
- * @return true if the player has activated all three tomes in the correct order, false otherwise
- */
-bool OperateNakrulBook(int s);
 bool objectIsDisabled(int i);
 
 } // namespace devilution