diff --git a/README.md b/README.md
index b0cd8ff..1ec3d6c 100644
--- a/README.md
+++ b/README.md
@@ -78,7 +78,7 @@ Then you can edit a `plantuml` code block with `plantuml-mode` by hitting `C-'`
 
 ```elisp
 #+BEGIN_SRC plantuml
-  <hit C-' here to open a plantuml-mode buffer>
+  <hit C-c ' here to open a plantuml-mode buffer>
 #+END_SRC
 ```