diff --git a/Concepts.md b/Concepts.md
index 9805b12..f1edfde 100644
--- a/Concepts.md
+++ b/Concepts.md
@@ -233,7 +233,7 @@ The handy REPL command prompt <kbd>]</kbd> understands environment variables (li
 
 The native command prompt remembers only the last executed command in the current session. To access and use the shell's history add a shell function similar to:
 
-```
+```sh
 h ()
 {
     fzf <~/shell-specific_history_file | tr -d '\n' | xsel -bi