diff --git a/news/24.bugfix.rst b/news/24.bugfix.rst
new file mode 100644
index 0000000..9ee6e80
--- /dev/null
+++ b/news/24.bugfix.rst
@@ -0,0 +1 @@
+Fix a typo that prevents ash and csh from being detected.
diff --git a/src/shellingham/_core.py b/src/shellingham/_core.py
index 6dea73b..da103a9 100644
--- a/src/shellingham/_core.py
+++ b/src/shellingham/_core.py
@@ -1,5 +1,5 @@
 SHELL_NAMES = {
-    'sh', 'bash', 'dash', 'ash'     # Bourne.
+    'sh', 'bash', 'dash', 'ash',    # Bourne.
     'csh', 'tcsh',                  # C.
     'ksh', 'zsh', 'fish',           # Common alternatives.
     'cmd', 'powershell', 'pwsh',    # Microsoft.