diff --git a/components/esp_rom/include/esp32/rom/miniz.h b/components/esp_rom/include/esp32/rom/miniz.h
index 7661f804468..5fefa84999a 100644
--- a/components/esp_rom/include/esp32/rom/miniz.h
+++ b/components/esp_rom/include/esp32/rom/miniz.h
@@ -760,7 +760,7 @@ typedef struct
 
 // Initializes the compressor.
 // There is no corresponding deinit() function because the tdefl API's do not dynamically allocate memory.
-// pBut_buf_func: If NULL, output data will be supplied to the specified callback. In this case, the user should call the tdefl_compress_buffer() API for compression.
+// pBut_buf_func: If **not** NULL, output data will be supplied to the specified callback. In this case, the user should call the tdefl_compress_buffer() API for compression.
 // If pBut_buf_func is NULL the user should always call the tdefl_compress() API.
 // flags: See the above enums (TDEFL_HUFFMAN_ONLY, TDEFL_WRITE_ZLIB_HEADER, etc.)
 tdefl_status tdefl_init(tdefl_compressor *d, tdefl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags);
diff --git a/components/esp_rom/include/esp32c2/rom/miniz.h b/components/esp_rom/include/esp32c2/rom/miniz.h
index ded9570b2bf..5671d84e346 100644
--- a/components/esp_rom/include/esp32c2/rom/miniz.h
+++ b/components/esp_rom/include/esp32c2/rom/miniz.h
@@ -734,7 +734,7 @@ typedef struct {
 
 // Initializes the compressor.
 // There is no corresponding deinit() function because the tdefl API's do not dynamically allocate memory.
-// pBut_buf_func: If NULL, output data will be supplied to the specified callback. In this case, the user should call the tdefl_compress_buffer() API for compression.
+// pBut_buf_func: If **not** NULL, output data will be supplied to the specified callback. In this case, the user should call the tdefl_compress_buffer() API for compression.
 // If pBut_buf_func is NULL the user should always call the tdefl_compress() API.
 // flags: See the above enums (TDEFL_HUFFMAN_ONLY, TDEFL_WRITE_ZLIB_HEADER, etc.)
 tdefl_status tdefl_init(tdefl_compressor *d, tdefl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags);
diff --git a/components/esp_rom/include/esp32c3/rom/miniz.h b/components/esp_rom/include/esp32c3/rom/miniz.h
index 4c8cb7a421d..aaef48c14af 100644
--- a/components/esp_rom/include/esp32c3/rom/miniz.h
+++ b/components/esp_rom/include/esp32c3/rom/miniz.h
@@ -729,7 +729,7 @@ typedef struct {
 
 // Initializes the compressor.
 // There is no corresponding deinit() function because the tdefl API's do not dynamically allocate memory.
-// pBut_buf_func: If NULL, output data will be supplied to the specified callback. In this case, the user should call the tdefl_compress_buffer() API for compression.
+// pBut_buf_func: If **not** NULL, output data will be supplied to the specified callback. In this case, the user should call the tdefl_compress_buffer() API for compression.
 // If pBut_buf_func is NULL the user should always call the tdefl_compress() API.
 // flags: See the above enums (TDEFL_HUFFMAN_ONLY, TDEFL_WRITE_ZLIB_HEADER, etc.)
 tdefl_status tdefl_init(tdefl_compressor *d, tdefl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags);
diff --git a/components/esp_rom/include/esp32h2/rom/miniz.h b/components/esp_rom/include/esp32h2/rom/miniz.h
index 4c8cb7a421d..aaef48c14af 100644
--- a/components/esp_rom/include/esp32h2/rom/miniz.h
+++ b/components/esp_rom/include/esp32h2/rom/miniz.h
@@ -729,7 +729,7 @@ typedef struct {
 
 // Initializes the compressor.
 // There is no corresponding deinit() function because the tdefl API's do not dynamically allocate memory.
-// pBut_buf_func: If NULL, output data will be supplied to the specified callback. In this case, the user should call the tdefl_compress_buffer() API for compression.
+// pBut_buf_func: If **not** NULL, output data will be supplied to the specified callback. In this case, the user should call the tdefl_compress_buffer() API for compression.
 // If pBut_buf_func is NULL the user should always call the tdefl_compress() API.
 // flags: See the above enums (TDEFL_HUFFMAN_ONLY, TDEFL_WRITE_ZLIB_HEADER, etc.)
 tdefl_status tdefl_init(tdefl_compressor *d, tdefl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags);
diff --git a/components/esp_rom/include/esp32s2/rom/miniz.h b/components/esp_rom/include/esp32s2/rom/miniz.h
index b9b9202aaa7..fd2fe3c9a19 100644
--- a/components/esp_rom/include/esp32s2/rom/miniz.h
+++ b/components/esp_rom/include/esp32s2/rom/miniz.h
@@ -745,7 +745,7 @@ typedef struct
 
 // Initializes the compressor.
 // There is no corresponding deinit() function because the tdefl API's do not dynamically allocate memory.
-// pBut_buf_func: If NULL, output data will be supplied to the specified callback. In this case, the user should call the tdefl_compress_buffer() API for compression.
+// pBut_buf_func: If **not** NULL, output data will be supplied to the specified callback. In this case, the user should call the tdefl_compress_buffer() API for compression.
 // If pBut_buf_func is NULL the user should always call the tdefl_compress() API.
 // flags: See the above enums (TDEFL_HUFFMAN_ONLY, TDEFL_WRITE_ZLIB_HEADER, etc.)
 tdefl_status tdefl_init(tdefl_compressor *d, tdefl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags);
diff --git a/components/esp_rom/include/esp32s3/rom/miniz.h b/components/esp_rom/include/esp32s3/rom/miniz.h
index 7553511349e..f095b539b9b 100644
--- a/components/esp_rom/include/esp32s3/rom/miniz.h
+++ b/components/esp_rom/include/esp32s3/rom/miniz.h
@@ -728,7 +728,7 @@ typedef struct {
 
 // Initializes the compressor.
 // There is no corresponding deinit() function because the tdefl API's do not dynamically allocate memory.
-// pBut_buf_func: If NULL, output data will be supplied to the specified callback. In this case, the user should call the tdefl_compress_buffer() API for compression.
+// pBut_buf_func: If **not** NULL, output data will be supplied to the specified callback. In this case, the user should call the tdefl_compress_buffer() API for compression.
 // If pBut_buf_func is NULL the user should always call the tdefl_compress() API.
 // flags: See the above enums (TDEFL_HUFFMAN_ONLY, TDEFL_WRITE_ZLIB_HEADER, etc.)
 tdefl_status tdefl_init(tdefl_compressor *d, tdefl_put_buf_func_ptr pPut_buf_func, void *pPut_buf_user, int flags);