ci: use two parallel build jobs on Travis-CI
Change-Id: I0d37709bd81bbff890c932b77dc5be696ac35569
diff --git a/.jenkins.d/README.md b/.jenkins.d/README.md
index b1bd93a..f6e3167 100644
--- a/.jenkins.d/README.md
+++ b/.jenkins.d/README.md
@@ -29,3 +29,5 @@
* empty: default build process
* `code-coverage` (Linux OS is assumed): debug build with tests and code coverage analysis
* `limited-build`: only a single debug build with tests
+
+- `WAF_JOBS`: number of parallel build jobs used by waf, defaults to 1.