README tweak

Signed-off-by: Dave Henderson <dhenderson@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/README.md b/README.md
index 4bf8254d..8bd2d74d 100644
--- a/README.md
+++ b/README.md
@@ -132,7 +132,7 @@ Of course, there are some drawbacks - any files to be used for [datasources][]
 must be mounted and any environment variables to be used must be passed through:
 
 ```console
-$ echo 'My voice is my $THING. {{(datasource "vault").value}}' \
+$ echo 'My voice is my {{.Env.THING}}. {{(datasource "vault").value}}' \
   | docker run -e THING=passport -v /home/me/.vault-token:/root/.vault-token hairyhenderson/gomplate -d vault=vault:///secret/sneakers
 My voice is my passport. Verify me.
 ```