diff --git a/trunk/research/st/sched.c b/trunk/research/st/sched.c
index 4252ede1a..0ec9559bf 100644
--- a/trunk/research/st/sched.c
+++ b/trunk/research/st/sched.c
@@ -564,7 +564,7 @@ _st_thread_t *st_thread_create(void *(*start)(void *arg), void *arg, int joinabl
     }
     stack->sp = sp - _ST_STACK_PAD_SIZE;
 #else
-    #error Unknown Stack Grown
+    #error "Only Supports Stack Grown Down"
 #endif
     
     memset(trd, 0, sizeof(_st_thread_t));
diff --git a/trunk/research/st/stk.c b/trunk/research/st/stk.c
index 5f6790d7b..c26223ba5 100644
--- a/trunk/research/st/stk.c
+++ b/trunk/research/st/stk.c
@@ -138,7 +138,7 @@ static char *_st_new_stk_segment(int size)
 #ifdef MALLOC_STACK
     void *vaddr = malloc(size);
 #else
-    #error Unknown Stack Malloc
+    #error "Only Supports Malloc Stack"
 #endif
     
     return (char *)vaddr;