diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index aa7b81aaf0..97b90cb0db 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -475,6 +475,11 @@ static inline void assert_no_pages_locked(void)
 struct MemoryRegionSection *iotlb_to_section(CPUState *cpu,
                                              hwaddr index, MemTxAttrs attrs);
 
+/*
+ * Note: tlb_fill() can trigger a resize of the TLB. This means that all of the
+ * caller's prior references to the TLB table (e.g. CPUTLBEntry pointers) must
+ * be discarded and looked up again (e.g. via tlb_entry()).
+ */
 void tlb_fill(CPUState *cpu, target_ulong addr, int size,
               MMUAccessType access_type, int mmu_idx, uintptr_t retaddr);