Refer to master branch only and drop reference to trunk branch name
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.
