diff --git a/labcodes/lab5/kern/process/proc.c b/labcodes/lab5/kern/process/proc.c
index 569728a..e6ff1f3 100644
--- a/labcodes/lab5/kern/process/proc.c
+++ b/labcodes/lab5/kern/process/proc.c
@@ -615,7 +615,7 @@ bad_mm:
     goto out;
 }
 
-// do_execve - call exit_mmap(mm)&pug_pgdir(mm) to reclaim memory space of current process
+// do_execve - call exit_mmap(mm)&put_pgdir(mm) to reclaim memory space of current process
 //           - call load_icode to setup new memory space accroding binary prog.
 int
 do_execve(const char *name, size_t len, unsigned char *binary, size_t size) {
diff --git a/labcodes/lab6/kern/process/proc.c b/labcodes/lab6/kern/process/proc.c
index 874e835..54aea05 100644
--- a/labcodes/lab6/kern/process/proc.c
+++ b/labcodes/lab6/kern/process/proc.c
@@ -625,7 +625,7 @@ bad_mm:
     goto out;
 }
 
-// do_execve - call exit_mmap(mm)&pug_pgdir(mm) to reclaim memory space of current process
+// do_execve - call exit_mmap(mm)&put_pgdir(mm) to reclaim memory space of current process
 //           - call load_icode to setup new memory space accroding binary prog.
 int
 do_execve(const char *name, size_t len, unsigned char *binary, size_t size) {
diff --git a/labcodes/lab7/kern/process/proc.c b/labcodes/lab7/kern/process/proc.c
index 1929aa0..33821f7 100644
--- a/labcodes/lab7/kern/process/proc.c
+++ b/labcodes/lab7/kern/process/proc.c
@@ -625,7 +625,7 @@ bad_mm:
     goto out;
 }
 
-// do_execve - call exit_mmap(mm)&pug_pgdir(mm) to reclaim memory space of current process
+// do_execve - call exit_mmap(mm)&put_pgdir(mm) to reclaim memory space of current process
 //           - call load_icode to setup new memory space accroding binary prog.
 int
 do_execve(const char *name, size_t len, unsigned char *binary, size_t size) {
diff --git a/labcodes/lab8/kern/process/proc.c b/labcodes/lab8/kern/process/proc.c
index 2288968..fc239eb 100644
--- a/labcodes/lab8/kern/process/proc.c
+++ b/labcodes/lab8/kern/process/proc.c
@@ -609,7 +609,7 @@ failed_cleanup:
     return ret;
 }
 
-// do_execve - call exit_mmap(mm)&pug_pgdir(mm) to reclaim memory space of current process
+// do_execve - call exit_mmap(mm)&put_pgdir(mm) to reclaim memory space of current process
 //           - call load_icode to setup new memory space accroding binary prog.
 int
 do_execve(const char *name, int argc, const char **argv) {
diff --git a/labcodes_answer/lab5_result/kern/process/proc.c b/labcodes_answer/lab5_result/kern/process/proc.c
index 8f4c2e7..31e42ad 100644
--- a/labcodes_answer/lab5_result/kern/process/proc.c
+++ b/labcodes_answer/lab5_result/kern/process/proc.c
@@ -647,7 +647,7 @@ bad_mm:
     goto out;
 }
 
-// do_execve - call exit_mmap(mm)&pug_pgdir(mm) to reclaim memory space of current process
+// do_execve - call exit_mmap(mm)&put_pgdir(mm) to reclaim memory space of current process
 //           - call load_icode to setup new memory space accroding binary prog.
 int
 do_execve(const char *name, size_t len, unsigned char *binary, size_t size) {
diff --git a/labcodes_answer/lab6_result/kern/process/proc.c b/labcodes_answer/lab6_result/kern/process/proc.c
index 0b47a0d..993869c 100644
--- a/labcodes_answer/lab6_result/kern/process/proc.c
+++ b/labcodes_answer/lab6_result/kern/process/proc.c
@@ -653,7 +653,7 @@ bad_mm:
     goto out;
 }
 
-// do_execve - call exit_mmap(mm)&pug_pgdir(mm) to reclaim memory space of current process
+// do_execve - call exit_mmap(mm)&put_pgdir(mm) to reclaim memory space of current process
 //           - call load_icode to setup new memory space accroding binary prog.
 int
 do_execve(const char *name, size_t len, unsigned char *binary, size_t size) {
diff --git a/labcodes_answer/lab7_result/kern/process/proc.c b/labcodes_answer/lab7_result/kern/process/proc.c
index 98090e0..9431cf6 100644
--- a/labcodes_answer/lab7_result/kern/process/proc.c
+++ b/labcodes_answer/lab7_result/kern/process/proc.c
@@ -667,7 +667,7 @@ bad_mm:
     goto out;
 }
 
-// do_execve - call exit_mmap(mm)&pug_pgdir(mm) to reclaim memory space of current process
+// do_execve - call exit_mmap(mm)&put_pgdir(mm) to reclaim memory space of current process
 //           - call load_icode to setup new memory space accroding binary prog.
 int
 do_execve(const char *name, size_t len, unsigned char *binary, size_t size) {
diff --git a/labcodes_answer/lab8_result/kern/process/proc.c b/labcodes_answer/lab8_result/kern/process/proc.c
index f3f3ca9..6182379 100644
--- a/labcodes_answer/lab8_result/kern/process/proc.c
+++ b/labcodes_answer/lab8_result/kern/process/proc.c
@@ -801,7 +801,7 @@ failed_cleanup:
     return ret;
 }
 
-// do_execve - call exit_mmap(mm)&pug_pgdir(mm) to reclaim memory space of current process
+// do_execve - call exit_mmap(mm)&put_pgdir(mm) to reclaim memory space of current process
 //           - call load_icode to setup new memory space accroding binary prog.
 int
 do_execve(const char *name, int argc, const char **argv) {
diff --git a/related_info/lab5/lab5-spoc-discuss/kern/process/proc.c b/related_info/lab5/lab5-spoc-discuss/kern/process/proc.c
index 8f4c2e7..31e42ad 100644
--- a/related_info/lab5/lab5-spoc-discuss/kern/process/proc.c
+++ b/related_info/lab5/lab5-spoc-discuss/kern/process/proc.c
@@ -647,7 +647,7 @@ bad_mm:
     goto out;
 }
 
-// do_execve - call exit_mmap(mm)&pug_pgdir(mm) to reclaim memory space of current process
+// do_execve - call exit_mmap(mm)&put_pgdir(mm) to reclaim memory space of current process
 //           - call load_icode to setup new memory space accroding binary prog.
 int
 do_execve(const char *name, size_t len, unsigned char *binary, size_t size) {