diff --git a/components/libc/compilers/newlib/minilib.c b/components/libc/compilers/newlib/minilib.c
index 92877bd6c3..ca1bea0f91 100644
--- a/components/libc/compilers/newlib/minilib.c
+++ b/components/libc/compilers/newlib/minilib.c
@@ -63,7 +63,6 @@ _free_r (struct _reent *ptr, void *addr)
 void *
 _sbrk_r(struct _reent *ptr, ptrdiff_t incr)
 {
-    /* no use this routine to get memory */
     return RT_NULL;
 }
 #endif /*RT_USING_HEAP*/
diff --git a/components/libc/compilers/newlib/syscalls.c b/components/libc/compilers/newlib/syscalls.c
index 444e3960c1..e54d7583cb 100644
--- a/components/libc/compilers/newlib/syscalls.c
+++ b/components/libc/compilers/newlib/syscalls.c
@@ -303,7 +303,6 @@ _free_r (struct _reent *ptr, void *addr)
 void *
 _sbrk_r(struct _reent *ptr, ptrdiff_t incr)
 {
-    /* no use this routine to get memory */
     return RT_NULL;
 }
 #endif /*RT_USING_HEAP*/