diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index c427e96..f0d1241 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -61,7 +61,7 @@
 --------------
 
 + Create a _topic branch_ for your isolated work.
-  * Usually you should base your branch on the `master` or `trunk` branch.
+  * Usually you should base your branch on the `master` branch.
   * A good topic branch name can be the JIRA bug id plus a keyword, e.g. `WEAVER-123-InputStream`.
   * If you have submitted multiple JIRA issues, try to maintain separate branches and pull requests.
 + Make commits of logical units.