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-rw-r--r--guides/source/layouts_and_rendering.md3
1 files changed, 2 insertions, 1 deletions
diff --git a/guides/source/layouts_and_rendering.md b/guides/source/layouts_and_rendering.md
index 60571750a1..6df56c4fee 100644
--- a/guides/source/layouts_and_rendering.md
+++ b/guides/source/layouts_and_rendering.md
@@ -248,7 +248,8 @@ service requests that are expecting something other than proper HTML.
NOTE: By default, if you use the `:plain` option, the text is rendered without
using the current layout. If you want Rails to put the text into the current
-layout, you need to add the `layout: true` option.
+layout, you need to add the `layout: true` option. Make sure to add a layout
+file with extension `.txt.erb`.
#### Rendering HTML