doc: Include CARGO_MANIFEST_DIR as being set for crates

diff --git a/src/doc/environment-variables.md b/src/doc/environment-variables.md
index 0b40f0bc01b43205d8eb2f7cbdf054c15e3baf52..3ac8190c118c3c62fd107f498b207fe7360fae8c 100644 (file)
--- a/src/doc/environment-variables.md
+++ b/src/doc/environment-variables.md
@@ -59,9 +59,9 @@ Here are a list of the variables Cargo sets, organized by when it sets them:
 
 # Environment variables Cargo sets for crates
 
+* `CARGO_MANIFEST_DIR` - The directory containing the manifest of your package.
 * `CARGO_PKG_VERSION` - The full version of your package.
 * `CARGO_PKG_VERSION_MAJOR` - The major version of your package.
 * `CARGO_PKG_VERSION_MINOR` - The minor version of your package.
 * `CARGO_PKG_VERSION_PATCH` - The patch version of your package.
 * `CARGO_PKG_VERSION_PRE` - The pre-release version of your package.
-