add reference about rubygems china mirror in advanced section

diff --git a/README.md b/README.md
index 2753107ae0a9fcd7665a681b2c937bb5c0b10da2..c6d69bf787b3b1ae299e7d0e85df76d9bbba2916 100644 (file)
--- a/README.md
+++ b/README.md
@@ -165,6 +165,7 @@ installs you can ensure they are in sync by looking at `/etc/passwd` and
 - [Setting up SSL with Discourse Docker](https://meta.discourse.org/t/allowing-ssl-for-your-discourse-docker-setup/13847)
 - [Multisite configuration with Docker](https://meta.discourse.org/t/multisite-configuration-with-docker/14084)
 - [Linking containers for a multiple container setup](https://meta.discourse.org/t/linking-containers-for-a-multiple-container-setup/20867)
+- [Replace rubygems.org with taobao mirror to resolve network error in China](https://meta.discourse.org/t/replace-rubygems-org-with-taobao-mirror-to-resolve-network-error-in-china/21988/1)
 
 License
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