diff --git a/ISSUE_TEMPLATE.md b/ISSUE_TEMPLATE.md
index 11278e55..9181f33f 100644
--- a/ISSUE_TEMPLATE.md
+++ b/ISSUE_TEMPLATE.md
@@ -1,3 +1,8 @@
+<!--
+NOTE: Please read the guidline to open a new issue at first.
+https://github.com/piroor/treestyletab/blob/master/CONTRIBUTING.md
+-->
+
 ## Short description
 
 ## Steps to reproduce
@@ -14,8 +19,6 @@
 
 ## Environment
 
- * Platform: [your platform here: Windows, OS X, or Linux with its version]
- * Version of Firefox: [version here]
- * Version of Tree Style Tab: [version or revision here]
- * Reproducible on clean environment?: [yes/no]
-   * Possible conflicting addons: [list of addons required to reproduce the problem, e.g. Tab Mix Plus, Classic Theme Restorer, etc.]
+ * Platform (OS): 
+ * Version of Firefox: 
+ * Version (or revision) of Tree Style Tab: