diff --git a/design/units.md b/design/units.md
index 1dfc30d..9345d95 100644
--- a/design/units.md
+++ b/design/units.md
@@ -38,7 +38,7 @@ in order of preference:
 - `/usr/src/fspl`
 - `/usr/include/fspl`
 
-On windows, these are used instead:
+On Windows, these are used instead:
 - `%LOCALAPPDATA%\fspl\src`
 - `%LOCALAPPDATA%\fspl\include`
 - `%ALLUSERSPROFILE%\fspl\src`