diff --git a/os/ports/GCC/ARMCMx/chcore_v6m.h b/os/ports/GCC/ARMCMx/chcore_v6m.h
index 5fda42a88..1b8f54528 100644
--- a/os/ports/GCC/ARMCMx/chcore_v6m.h
+++ b/os/ports/GCC/ARMCMx/chcore_v6m.h
@@ -77,7 +77,7 @@
  *          separate interrupt stack and the stack space between @p intctx and
  *          @p extctx is known to be zero.
  * @note    In this port it is conservatively set to 16 because the function
- *          @p chSchDoReschedule() can have a stack frame, expecially with
+ *          @p chSchDoReschedule() can have a stack frame, especially with
  *          compiler optimizations disabled.
  */
 #if !defined(PORT_INT_REQUIRED_STACK)
diff --git a/os/ports/GCC/ARMCMx/chcore_v7m.h b/os/ports/GCC/ARMCMx/chcore_v7m.h
index 67850cd77..235f64acf 100644
--- a/os/ports/GCC/ARMCMx/chcore_v7m.h
+++ b/os/ports/GCC/ARMCMx/chcore_v7m.h
@@ -74,7 +74,7 @@
  *          separate interrupt stack and the stack space between @p intctx and
  *          @p extctx is known to be zero.
  * @note    In this port it is conservatively set to 16 because the function
- *          @p chSchDoReschedule() can have a stack frame, expecially with
+ *          @p chSchDoReschedule() can have a stack frame, especially with
  *          compiler optimizations disabled.
  */
 #if !defined(PORT_INT_REQUIRED_STACK)
diff --git a/os/ports/IAR/ARMCMx/chcore_v6m.h b/os/ports/IAR/ARMCMx/chcore_v6m.h
index a0b94dce6..4a3294ef7 100644
--- a/os/ports/IAR/ARMCMx/chcore_v6m.h
+++ b/os/ports/IAR/ARMCMx/chcore_v6m.h
@@ -77,7 +77,7 @@
  *          separate interrupt stack and the stack space between @p intctx and
  *          @p extctx is known to be zero.
  * @note    In this port it is conservatively set to 16 because the function
- *          @p chSchDoReschedule() can have a stack frame, expecially with
+ *          @p chSchDoReschedule() can have a stack frame, especially with
  *          compiler optimizations disabled.
  */
 #if !defined(PORT_INT_REQUIRED_STACK)
diff --git a/os/ports/IAR/ARMCMx/chcore_v7m.h b/os/ports/IAR/ARMCMx/chcore_v7m.h
index 248e8c4ee..2cbf5504a 100644
--- a/os/ports/IAR/ARMCMx/chcore_v7m.h
+++ b/os/ports/IAR/ARMCMx/chcore_v7m.h
@@ -74,7 +74,7 @@
  *          separate interrupt stack and the stack space between @p intctx and
  *          @p extctx is known to be zero.
  * @note    In this port it is conservatively set to 16 because the function
- *          @p chSchDoReschedule() can have a stack frame, expecially with
+ *          @p chSchDoReschedule() can have a stack frame, especially with
  *          compiler optimizations disabled.
  */
 #if !defined(PORT_INT_REQUIRED_STACK)
diff --git a/os/ports/RVCT/ARMCMx/chcore_v6m.h b/os/ports/RVCT/ARMCMx/chcore_v6m.h
index 10e94b54f..8140022f7 100644
--- a/os/ports/RVCT/ARMCMx/chcore_v6m.h
+++ b/os/ports/RVCT/ARMCMx/chcore_v6m.h
@@ -77,7 +77,7 @@
  *          separate interrupt stack and the stack space between @p intctx and
  *          @p extctx is known to be zero.
  * @note    In this port it is conservatively set to 16 because the function
- *          @p chSchDoReschedule() can have a stack frame, expecially with
+ *          @p chSchDoReschedule() can have a stack frame, especially with
  *          compiler optimizations disabled.
  */
 #if !defined(PORT_INT_REQUIRED_STACK)
diff --git a/os/ports/RVCT/ARMCMx/chcore_v7m.h b/os/ports/RVCT/ARMCMx/chcore_v7m.h
index ac175e2be..19bd1c657 100644
--- a/os/ports/RVCT/ARMCMx/chcore_v7m.h
+++ b/os/ports/RVCT/ARMCMx/chcore_v7m.h
@@ -74,7 +74,7 @@
  *          separate interrupt stack and the stack space between @p intctx and
  *          @p extctx is known to be zero.
  * @note    In this port it is conservatively set to 16 because the function
- *          @p chSchDoReschedule() can have a stack frame, expecially with
+ *          @p chSchDoReschedule() can have a stack frame, especially with
  *          compiler optimizations disabled.
  */
 #if !defined(PORT_INT_REQUIRED_STACK)