diff --git a/components/xtensa/expression_with_stack_xtensa.c b/components/xtensa/expression_with_stack_xtensa.c
index 310d924485..6f9cf4ca3c 100644
--- a/components/xtensa/expression_with_stack_xtensa.c
+++ b/components/xtensa/expression_with_stack_xtensa.c
@@ -6,8 +6,7 @@ StackType_t * esp_switch_stack_setup(StackType_t *stack, size_t stack_size)
 {
     int watchpoint_place = (((int)stack + 31) & ~31);
     StackType_t *top_of_stack =  (StackType_t *)&stack[0] +                  
-            (sizeof(stack_size * sizeof(StackType_t)) /  
-            sizeof(StackType_t));
+            ((stack_size * sizeof(StackType_t)) / sizeof(StackType_t));
 
     //Align stack to a 16byte boundary, as required by CPU specific:
     top_of_stack =  (StackType_t *)(((UBaseType_t)(top_of_stack - 31) -
diff --git a/docs/en/api-reference/system/esp_expression_with_stack.rst b/docs/en/api-reference/system/esp_expression_with_stack.rst
index cf77b26836..343d2fe0dc 100644
--- a/docs/en/api-reference/system/esp_expression_with_stack.rst
+++ b/docs/en/api-reference/system/esp_expression_with_stack.rst
@@ -19,7 +19,7 @@ Usage
 a mutex object allocated by the caller, which is used to protect if 
 the same function shares its allocated stack, a pointer to the top 
 of stack used to that fuction, and the function itself, note the
-function is passed extactly in the same way as do when you call 
+function is passed exactly in the same way as do when you call 
 it on a regular way. 
 
 The usage may looks like the code below:
@@ -40,7 +40,8 @@ The usage may looks like the code below:
         ESP_EXECUTE_EXPRESSION_WITH_STACK(printf_lock, 
                                         shared_stack, 
                                         printf("Executing this from external stack! \n"));
-        free(shared_stack);    
+        vSemaphoreDelete(printf_lock);    
+        free(shared_stack); 
     }
 
 .. _esp-call-with-stack-basic_usage:
diff --git a/docs/en/api-reference/system/index.rst b/docs/en/api-reference/system/index.rst
index 13fbaf0fa5..65f06522cd 100644
--- a/docs/en/api-reference/system/index.rst
+++ b/docs/en/api-reference/system/index.rst
@@ -18,7 +18,7 @@ System API
     High Resolution Timer <esp_timer>
     Himem (large external SPI RAM) API <himem>
     Inter-Processor Call <ipc>
-    Call function with external stack<esp_expression_with_stack>
+    Call function with external stack <esp_expression_with_stack>
     Interrupt Allocation <intr_alloc>
     Logging <log>
     Miscellaneous System APIs <system>