diff --git a/aribb25/arib_std_b25.c b/aribb25/arib_std_b25.c
index d812b6d..c682ab5 100644
--- a/aribb25/arib_std_b25.c
+++ b/aribb25/arib_std_b25.c
@@ -329,7 +329,7 @@ enum PID_MAP_TYPE {
 };
 
 /*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
- function prottypes (interface method)
+ function prototypes (interface method)
  ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
 static void release_arib_std_b25(void *std_b25);
 static int set_multi2_round_arib_std_b25(void *std_b25, int32_t round);
@@ -393,7 +393,7 @@ ARIB_STD_B25 *create_arib_std_b25(void)
 }
 
 /*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
- function prottypes (private method)
+ function prototypes (private method)
  ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
 static ARIB_STD_B25_PRIVATE_DATA *private_data(void *std_b25);
 static void teardown(ARIB_STD_B25_PRIVATE_DATA *prv);
diff --git a/aribb25/b_cas_card.c b/aribb25/b_cas_card.c
index 5e8cb46..1dd1d8e 100644
--- a/aribb25/b_cas_card.c
+++ b/aribb25/b_cas_card.c
@@ -94,7 +94,7 @@ static const uint8_t EMM_RECEIVE_CMD_HEADER[] = {
 #define B_CAS_BUFFER_MAX (4*1024)
 
 /*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
- function prottypes (interface method)
+ function prototypes (interface method)
  ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
 static void release_b_cas_card(void *bcas);
 static int init_b_cas_card(void *bcas);
@@ -136,7 +136,7 @@ B_CAS_CARD *create_b_cas_card(void)
 }
 
 /*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
- function prottypes (private method)
+ function prototypes (private method)
  ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
 static B_CAS_CARD_PRIVATE_DATA *private_data(void *bcas);
 static void teardown(B_CAS_CARD_PRIVATE_DATA *prv);
diff --git a/aribb25/multi2.c b/aribb25/multi2.c
index 3cde91a..56b3460 100644
--- a/aribb25/multi2.c
+++ b/aribb25/multi2.c
@@ -66,7 +66,7 @@ typedef struct {
 #define MULTI2_STATE_SCRAMBLE_KEY_SET (0x0004)
 
 /*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
- function prottypes (interface method)
+ function prototypes (interface method)
  ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
 static void release_multi2(void *m2);
 static int add_ref_multi2(void *m2);
@@ -120,7 +120,7 @@ MULTI2 *create_multi2(void)
 }
 
 /*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
- function prottypes (private method)
+ function prototypes (private method)
  ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
 static MULTI2_PRIVATE_DATA *private_data(void *m2);
 
diff --git a/aribb25/multi2.cc b/aribb25/multi2.cc
index 42aa348..98961c9 100644
--- a/aribb25/multi2.cc
+++ b/aribb25/multi2.cc
@@ -103,7 +103,7 @@ struct multi2 : public MULTI2 {
 }
 
 /*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
- function prottypes (interface method)
+ function prototypes (interface method)
  ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
 static void release_multi2(void *m2);
 static int add_ref_multi2(void *m2);
@@ -147,7 +147,7 @@ MULTI2 *create_multi2()
 }
 
 /*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
- function prottypes (private method)
+ function prototypes (private method)
  ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
 static multi2::multi2 *private_data(void *m2);
 
diff --git a/aribb25/multi2_simd.c b/aribb25/multi2_simd.c
index d557cdc..2d13d0d 100644
--- a/aribb25/multi2_simd.c
+++ b/aribb25/multi2_simd.c
@@ -62,7 +62,7 @@ static enum INSTRUCTION_TYPE simd_instruction = INSTRUCTION_NORMAL;
 static bool is_mask_initialized = false;
 
 /*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
- function prottypes (private method)
+ function prototypes (private method)
  ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
 static inline const uint32_t left_rotate_uint32_for_simd(const uint32_t value, const uint32_t rotate);
 static inline __m128i left_rotate_m128i(const __m128i *value, const int rotate);
diff --git a/aribb25/ts_section_parser.c b/aribb25/ts_section_parser.c
index 4f2f50a..360f003 100644
--- a/aribb25/ts_section_parser.c
+++ b/aribb25/ts_section_parser.c
@@ -40,7 +40,7 @@ typedef struct {
 #define MAX_RAW_SECTION_SIZE 4100
 
 /*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
- function prottypes (interface method)
+ function prototypes (interface method)
  ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
 static void release_ts_section_parser(void *parser);
 static int reset_ts_section_parser(void *parser);
@@ -89,7 +89,7 @@ TS_SECTION_PARSER *create_ts_section_parser(void)
 }
 
 /*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
- function prottypes (private method)
+ function prototypes (private method)
  ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
 static TS_SECTION_PARSER_PRIVATE_DATA *private_data(void *parser);
 static void teardown(TS_SECTION_PARSER_PRIVATE_DATA *prv);