diff --git a/MultiTimer.c b/MultiTimer.c
index 99d1d37..8c18b99 100644
--- a/MultiTimer.c
+++ b/MultiTimer.c
@@ -20,7 +20,7 @@ int MultiTimerInstall(PlatformTicksFunction_t ticksFunc)
 
 int MultiTimerStart(MultiTimer* timer, uint32_t timing, MultiTimerCallback_t callback, void* userData)
 {
-    if (!timer || !callback || timing > MULTIMER_MAX_TIMEOUT) {
+    if (!timer || !callback || timing > MULTIMER_MAX_TIMEOUT / 2 ) {
         return -1;
     }
     MultiTimer** nextTimer = &timerList;
diff --git a/MultiTimer.h b/MultiTimer.h
index 23926ef..3ae6671 100644
--- a/MultiTimer.h
+++ b/MultiTimer.h
@@ -1,3 +1,25 @@
+/*
+ * Copyright (c) 2021 0x1abin
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
 #ifndef _MULTI_TIMER_H_
 #define _MULTI_TIMER_H_