diff --git a/docs/src/_docs/guide.md b/docs/src/_docs/guide.md
index 34a271e93..ae18892d8 100644
--- a/docs/src/_docs/guide.md
+++ b/docs/src/_docs/guide.md
@@ -169,7 +169,7 @@ model = gdemo(fill(missing, 2))
 c = sample(model, HMC(500, 0.01, 5))
 ```
 
-The above case tells the model compiler the dimensions of the values it needs to generate. The generated values for `x` can be extracted from the `Chains` object using `c[x]`.
+The above case tells the model compiler the dimensions of the values it needs to generate. The generated values for `x` can be extracted from the `Chains` object using `c[:x]`.
 
 #### Using Argument Defaults