diff --git a/API/Z80.h b/API/Z80.h
index 7db5601..3966b07 100644
--- a/API/Z80.h
+++ b/API/Z80.h
@@ -169,8 +169,8 @@ typedef struct {
* fetch M-cycle. The function must return the byte located at the
* memory address specified by the 2nd parameter.
*
- * @attention This callback is mandatory, initializing it to @c Z_NULL
- * will cause the program to crash. */
+ * @attention This callback is mandatory, setting it to @c Z_NULL will
+ * cause the program to crash. */
Z80Read fetch_opcode;
@@ -184,8 +184,8 @@ typedef struct {
* immediate operand. The function must return the byte located at the
* memory address specified by the 2nd parameter.
*
- * @attention This callback is mandatory, initializing it to @c Z_NULL
- * will cause the program to crash. */
+ * @attention This callback is mandatory, setting it to @c Z_NULL will
+ * cause the program to crash. */
Z80Read fetch;
@@ -195,8 +195,8 @@ typedef struct {
* read M-cycle. The function must return the byte located at the
* memory address specified by the 2nd parameter.
*
- * @attention This callback is mandatory, initializing it to @c Z_NULL
- * will cause the program to crash. */
+ * @attention This callback is mandatory, setting it to @c Z_NULL will
+ * cause the program to crash. */
Z80Read read;
@@ -206,8 +206,8 @@ typedef struct {
* write M-cycle. The function must write the value of the 3rd
* parameter into the memory location specified by the 2nd parameter.
*
- * @attention This callback is mandatory, initializing it to @c Z_NULL
- * will cause the program to crash. */
+ * @attention This callback is mandatory, setting it to @c Z_NULL will
+ * cause the program to crash. */
Z80Write write;
@@ -217,8 +217,8 @@ typedef struct {
* read M-cycle. The function must return the byte read from the I/O
* port specified by the 2nd parameter.
*
- * @attention This callback is mandatory, initializing it to @c Z_NULL
- * will cause the program to crash. */
+ * @attention This callback is mandatory, setting it to @c Z_NULL will
+ * cause the program to crash. */
Z80Read in;
@@ -228,39 +228,39 @@ typedef struct {
* write M-cycle. The function must write the value of the 3rd
* parameter to the port specified by the 2nd parameter.
*
- * @attention This callback is mandatory, initializing it to @c Z_NULL
- * will cause the program to crash. */
+ * @attention This callback is mandatory, setting it to @c Z_NULL will
+ * cause the program to crash. */
Z80Write out;
/** @brief Callback invoked when the state of the HALT line changes.
*
- * @attention This callback is optional and must be initialized to
- * @c Z_NULL if not used. */
+ * @attention This callback is optional and must be set to @c Z_NULL
+ * when not used. */
Z80HALT halt;
/** @brief Callback invoked to perform the disregarded opcode fetch of
* an internal NOP operation.
*
- * @attention This callback is optional and must be initialized to
- * @c Z_NULL if not used. */
+ * @attention This callback is optional and must be set to @c Z_NULL
+ * when not used. */
Z80Read nop;
/** @brief Callback invoked to perform the disregarded opcode fetch of
* a non-maskable interrupt acknowledge.
*
- * @attention This callback is optional and must be initialized to
- * @c Z_NULL if not used. */
+ * @attention This callback is optional and must be set to @c Z_NULL
+ * when not used. */
Z80Read nmia;
/** @brief Callback invoked to perform the data bus read of a maskable
* interrupt acknowledge.
*
- * @attention This callback is optional and must be initialized to
- * @c Z_NULL if not used. */
+ * @attention This callback is optional and must be set to @c Z_NULL
+ * when not used. */
Z80Read inta;
@@ -268,60 +268,60 @@ typedef struct {
* during a maskable interrupt response in mode 0.
*
* @attention This callback becomes mandatory when the @c Z80.inta
- * callback is used. Initializing it to @c Z_NULL will cause the
- * program to crash. */
+ * callback is used. Setting it to @c Z_NULL will cause the program to
+ * crash. */
Z80Read int_fetch;
/* @brief Callback invoked to query the duration of a RESET signal.
*
- * @attention This callback is optional and must be initialized to
- * @c Z_NULL if not used. */
+ * @attention This callback is optional and must be set to @c Z_NULL
+ * when not used. */
Z80Reset reset;
/** @brief Callback invoked when an ld i,a instruction is
* fetched.
*
- * @attention This callback is optional and must be initialized to
- * @c Z_NULL if not used. */
+ * @attention This callback is optional and must be set to @c Z_NULL
+ * when not used. */
Z80Notify ld_i_a;
/** @brief Callback invoked when an ld r,a instruction is
* fetched.
*
- * @attention This callback is optional and must be initialized to
- * @c Z_NULL if not used. */
+ * @attention This callback is optional and must be set to @c Z_NULL
+ * when not used. */
Z80Notify ld_r_a;
/** @brief Callback invoked when a @c reti instruction is fetched.
*
- * @attention This callback is optional and must be initialized to
- * @c Z_NULL if not used. */
+ * @attention This callback is optional and must be set to @c Z_NULL
+ * when not used. */
Z80Notify reti;
/** @brief Callback invoked when a @c retn instruction is fetched.
*
- * @attention This callback is optional and must be initialized to
- * @c Z_NULL if not used. */
+ * @attention This callback is optional and must be set to @c Z_NULL
+ * when not used. */
Z80Notify retn;
/** @brief Callback invoked when a trap is fecthed.
*
- * @attention This callback is optional and must be initialized to
- * @c Z_NULL if not used. */
+ * @attention This callback is optional and must be set to @c Z_NULL
+ * when not used. */
Z80Read hook;
/** @brief Callback invoked to delegate the emulation of an illegal
* opcode.
*
- * @attention This callback is optional and must be initialized to
- * @c Z_NULL if not used. */
+ * @attention This callback is optional and must be set to @c Z_NULL
+ * when not used. */
Z80Illegal illegal;