diff --git a/keyboards/vision_division/config.h b/keyboards/vision_division/config.h
index 1f8466a54..93c960671 100644
--- a/keyboards/vision_division/config.h
+++ b/keyboards/vision_division/config.h
@@ -33,6 +33,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 /* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed */
 #define DEBOUNCING_DELAY 5
 
+#define MATRIX_MASKED
+
 /* define if matrix has ghost (lacks anti-ghosting diodes) */
 //#define MATRIX_HAS_GHOST
 
diff --git a/keyboards/vision_division/keymaps/default/keymap.c b/keyboards/vision_division/keymaps/default/keymap.c
index 8622ee521..3282761c0 100644
--- a/keyboards/vision_division/keymaps/default/keymap.c
+++ b/keyboards/vision_division/keymaps/default/keymap.c
@@ -142,6 +142,17 @@ enum keyboard_macros {
 #define ________________    _______, _______
 #define XXXXXXXXXXXXXXXX    XXXXXXX, XXXXXXX
 
+const matrix_row_t matrix_mask[MATRIX_ROWS] =
+{
+//  1098765432109876543210987654321
+  0b0000000001111111101111011111111,
+  0b0000000001111111111111111111111,
+  0b0000000001111111111111111111111,
+  0b0000000001111111111111111111111,
+  0b0000000001010111111111111111111,
+  0b0000000001111101111111101011111,
+};
+
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] =
 {
 /* LAYER = LAYER_QWERTY
diff --git a/quantum/matrix.c b/quantum/matrix.c
index 3174e0739..ac81794e5 100644
--- a/quantum/matrix.c
+++ b/quantum/matrix.c
@@ -26,6 +26,10 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "util.h"
 #include "matrix.h"
 
+#ifdef MATRIX_MASKED
+extern const matrix_row_t matrix_mask[];
+#endif
+
 /* Set 0 if debouncing isn't needed */
 
 #ifndef DEBOUNCING_DELAY
@@ -218,15 +222,34 @@ bool matrix_is_on(uint8_t row, uint8_t col)
 inline
 matrix_row_t matrix_get_row(uint8_t row)
 {
+    // Matrix mask lets you disable switches in the returned matrix data. For example, if you have a
+    // switch blocker installed and the switch is always pressed.
+#ifdef MATRIX_MASKED
+    return matrix[row] & matrix_mask[row];
+#else
     return matrix[row];
+#endif
 }
 
 void matrix_print(void)
 {
+#if (MATRIX_COLS <= 8)
+    print("\nr/c 01234567\n");
+#elif (MATRIX_COLS <= 16)
     print("\nr/c 0123456789ABCDEF\n");
+#elif (MATRIX_COLS <= 32)
+    print("\nr/c 0123456789ABCDEF0123456789ABCDEF\n");
+#endif
+
     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
         phex(row); print(": ");
-        pbin_reverse16(matrix_get_row(row));
+#if (MATRIX_COLS <= 8)
+        print_bin_reverse8(matrix_get_row(row));
+#elif (MATRIX_COLS <= 16)
+        print_bin_reverse16(matrix_get_row(row));
+#elif (MATRIX_COLS <= 32)
+        print_bin_reverse32(matrix_get_row(row));
+#endif
         print("\n");
     }
 }
@@ -235,7 +258,13 @@ uint8_t matrix_key_count(void)
 {
     uint8_t count = 0;
     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+#if (MATRIX_COLS <= 8)
+        count += bitpop(matrix[i]);
+#elif (MATRIX_COLS <= 16)
         count += bitpop16(matrix[i]);
+#elif (MATRIX_COLS <= 32)
+        count += bitpop32(matrix[i]);
+#endif
     }
     return count;
 }
@@ -259,7 +288,7 @@ static matrix_row_t read_cols(void)
     matrix_row_t result = 0;
 
 #if DIODE_DIRECTION == COL2ROW
-    for(int x = 0; x < MATRIX_COLS; x++) {     
+    for(int x = 0; x < MATRIX_COLS; x++) {
         int pin = col_pins[x];
 #else
     for(int x = 0; x < MATRIX_ROWS; x++) {
@@ -273,10 +302,10 @@ static matrix_row_t read_cols(void)
 static void unselect_rows(void)
 {
 #if DIODE_DIRECTION == COL2ROW
-    for(int x = 0; x < MATRIX_ROWS; x++) { 
+    for(int x = 0; x < MATRIX_ROWS; x++) {
         int pin = row_pins[x];
 #else
-    for(int x = 0; x < MATRIX_COLS; x++) { 
+    for(int x = 0; x < MATRIX_COLS; x++) {
         int pin = col_pins[x];
 #endif
         _SFR_IO8((pin >> 4) + 1) &=  ~_BV(pin & 0xF);
diff --git a/readme.md b/readme.md
index 62d479ff1..c460933a7 100644
--- a/readme.md
+++ b/readme.md
@@ -241,6 +241,7 @@ You can also add extra options at the end of the make command line, after the ta
 * `make COLOR=false` - turns off color output
 * `make SILENT=true` - turns off output besides errors/warnings
 * `make VERBOSE=true` - outputs all of the gcc stuff (not interesting, unless you need to debug)
+* `make EXTRAFLAGS=-E` - Preprocess the code without doing any compiling (useful if you are trying to debug #define commands)
 
 The make command itself also has some additional options, type `make --help` for more information. The most useful is probably `-jx`, which specifies that you want to compile using more than one CPU, the `x` represents the number of CPUs that you want to use. Setting that can greatly reduce the compile times, especially if you are compiling many keyboards/keymaps. I usually set it to one less than the number of CPUs that I have, so that I have some left for doing other things while it's compiling. Note that not all operating systems and make versions supports that option.
 
diff --git a/tmk_core/common/command.c b/tmk_core/common/command.c
index f3e1bf623..5f29bc0b4 100644
--- a/tmk_core/common/command.c
+++ b/tmk_core/common/command.c
@@ -379,11 +379,11 @@ static bool command_common(uint8_t code)
             debug_enable = !debug_enable;
             if (debug_enable) {
                 print("\ndebug: on\n");
-                debug_matrix   = true;
-                debug_keyboard = true;
-                debug_mouse    = true;
             } else {
                 print("\ndebug: off\n");
+                debug_matrix   = false;
+                debug_keyboard = false;
+                debug_mouse    = false;
             }
             break;