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-rw-r--r--doc/contributing/building_ruby.md1
1 files changed, 1 insertions, 0 deletions
diff --git a/doc/contributing/building_ruby.md b/doc/contributing/building_ruby.md
index 63e3a4f429..a1617c190a 100644
--- a/doc/contributing/building_ruby.md
+++ b/doc/contributing/building_ruby.md
@@ -9,6 +9,7 @@
* bison - 3.0 or later
* gperf - 3.0.3 or later
* ruby - 2.2 or later
+ * We can upgrade this version to system ruby version of the latest Ubuntu LTS.
2. Install optional, recommended dependencies: