diff --git a/docs/options.md b/docs/options.md
index f3624660..c4dc99a4 100644
--- a/docs/options.md
+++ b/docs/options.md
@@ -499,6 +499,10 @@ Platform-specific environment variables are also available:<br/>
     # Append a directory to the PATH variable (this is expanded in the build environment)
     CIBW_ENVIRONMENT: "PATH=$PATH:/usr/local/bin"
 
+    # Prepend a directory containing spaces on Windows.
+    CIBW_ENVIRONMENT_WINDOWS: >-
+      PATH="C:\\Program Files\\PostgreSQL\\13\\bin;$PATH"
+
     # Set BUILD_TIME to the output of the `date` command
     CIBW_ENVIRONMENT: "BUILD_TIME=$(date)"