diff --git a/monitor.c b/monitor.c
index 370bdfe..a8db870 100644
--- a/monitor.c
+++ b/monitor.c
@@ -784,7 +784,7 @@
 
     { 0xb5, "kp_divide" },
     { 0x37, "kp_multiply" },
-    { 0x4a, "kp_substract" },
+    { 0x4a, "kp_subtract" },
     { 0x4e, "kp_add" },
     { 0x9c, "kp_enter" },
     { 0x53, "kp_decimal" },
diff --git a/qemu-img.c b/qemu-img.c
index 6b470a1..e7d190b 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -297,7 +297,7 @@
     drv = bdrv_find_format(fmt);
     if (!drv)
         error("Unknown file format '%s'", fmt);
-    printf("Formating '%s', fmt=%s",
+    printf("Formatting '%s', fmt=%s",
            filename, fmt);
     if (encrypted)
         printf(", encrypted");
diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h
index 6b627f2..57e4662 100644
--- a/target-ppc/cpu.h
+++ b/target-ppc/cpu.h
@@ -1326,7 +1326,7 @@
     EXCP_FP_ZX         = 0x03,  /* FP divide by zero                */
     EXCP_FP_XX         = 0x04,  /* FP inexact                       */
     EXCP_FP_VXNAN      = 0x05,  /* FP invalid SNaN op               */
-    EXCP_FP_VXISI      = 0x06,  /* FP invalid infinite substraction */
+    EXCP_FP_VXISI      = 0x06,  /* FP invalid infinite subtraction */
     EXCP_FP_VXIDI      = 0x07,  /* FP invalid infinite divide       */
     EXCP_FP_VXZDZ      = 0x08,  /* FP invalid zero divide           */
     EXCP_FP_VXIMZ      = 0x09,  /* FP invalid infinite * zero       */
diff --git a/target-ppc/op.c b/target-ppc/op.c
index 019594c..546f12a 100644
--- a/target-ppc/op.c
+++ b/target-ppc/op.c
@@ -1025,7 +1025,7 @@
 }
 #endif
 
-/* substract from */
+/* subtract from */
 PPC_OP(subf)
 {
     T0 = T1 - T0;
@@ -1058,7 +1058,7 @@
 }
 #endif
 
-/* substract from carrying */
+/* subtract from carrying */
 void OPPROTO op_check_subfc (void)
 {
     if (likely((uint32_t)T0 > (uint32_t)T1)) {
@@ -1081,7 +1081,7 @@
 }
 #endif
 
-/* substract from extended */
+/* subtract from extended */
 void OPPROTO op_subfe (void)
 {
     do_subfe();
@@ -1096,7 +1096,7 @@
 }
 #endif
 
-/* substract from immediate carrying */
+/* subtract from immediate carrying */
 void OPPROTO op_subfic (void)
 {
     T0 = (int32_t)PARAM1 + ~T0 + 1;
@@ -1121,7 +1121,7 @@
 }
 #endif
 
-/* substract from minus one extended */
+/* subtract from minus one extended */
 void OPPROTO op_subfme (void)
 {
     T0 = ~T0 + xer_ca - 1;
@@ -1154,7 +1154,7 @@
 }
 #endif
 
-/* substract from zero extended */
+/* subtract from zero extended */
 void OPPROTO op_subfze (void)
 {
     T1 = ~T0;