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diff --git a/software/bash.page b/software/bash.page
index 5c81d3f..0d5325b 100644
--- a/software/bash.page
+++ b/software/bash.page
@@ -42,3 +42,5 @@ life difficult. Sometimes `|| true` is enough to get around this.
Google has a style guide: https://google.github.io/styleguide/shell.xml
Shellcheck is a lint tool: https://www.shellcheck.net/
+
+http://redsymbol.net/articles/unofficial-bash-strict-mode/