diff --git a/components/max17048/max17048.cpp b/components/max17048/max17048.cpp
index a74b346..1939631 100644
--- a/components/max17048/max17048.cpp
+++ b/components/max17048/max17048.cpp
@@ -10,12 +10,15 @@ namespace esphome
         static const char *const TAG = "max17048";
 
         // Data sheet: https://www.analog.com/media/en/technical-documentation/data-sheets/MAX17048-MAX17049.pdf
+        // NOTE: all registers must be accessed as 16-bit words (8-bit writes
+        // have no effect per the data sheet), so a word write through a
+        // misaligned address would span two registers.
         constexpr uint16_t REG_VCELL = 0x02;     // ADC measurement of VCELL. LSB: 78.125µV/cell
         constexpr uint16_t REG_SOC = 0x04;       // Battery state of charge.  LSB: 1%/256
         constexpr uint16_t REG_MODE = 0x06;      // Operating mode
         constexpr uint16_t REG_VERSION = 0x08;   // Version number
-        constexpr uint16_t REG_HIBRT = 0x0B;     // Hibernate threshold. Read/write.     Default: 0x971C
-        constexpr uint16_t REG_CONFIG = 0x0C;    // Configuration register. Read/write. Default: 0x00FF
+        constexpr uint16_t REG_HIBRT = 0x0A;     // Hibernate thresholds. Read/write.    Default: 0x8030
+        constexpr uint16_t REG_CONFIG = 0x0C;    // Configuration register. Read/write. Default: 0x971C
         constexpr uint16_t REG_VALRT = 0x14;     // Voltage alert threshold. Read/write. Default: 0x00FF
         constexpr uint16_t REG_CRATE = 0x16;     // Current rate. LSB: 0.208%/hr
         constexpr uint16_t REG_VRESET_ID = 0x18; //  VCELL-reset-threshold and chip ID. Read/write. Default: 0x96??