diff --git a/src/components/form/README.md b/src/components/form/README.md
index 0bf168c0378..e83e6459fb7 100644
--- a/src/components/form/README.md
+++ b/src/components/form/README.md
@@ -110,7 +110,7 @@ visitors with class `.sr-only`.
       <label class="sr-only" for="inlineFormInputName2">Name</label>
       <b-input class="mb-2 mr-sm-2 mb-sm-0" id="inlineFormInputName2" placeholder="Jane Doe" />
       <label class="sr-only" for="inlineFormInputGroupUsername2">Username</label>
-      <b-input-group left="@" class="mb-2 mr-sm-2 mb-sm-0">
+      <b-input-group prepend="@" class="mb-2 mr-sm-2 mb-sm-0">
         <b-input id="inlineFormInputGroupUsername2" placeholder="Username" />
       </b-input-group>
       <b-form-checkbox class="mb-2 mr-sm-2 mb-sm-0">Remember me</b-form-checkbox>