diff --git a/_includes/navbar.html b/_includes/navbar.html
index 84aca56..3b2f43c 100644
--- a/_includes/navbar.html
+++ b/_includes/navbar.html
@@ -91,6 +91,7 @@
                         <input id="main-search-input"
                                type="text"
                                aria-label="Search"
+                               aria-describedby="main-search-instructions"
                                class="form-control st-default-search-input"
                                placeholder="Search"
                                role="combobox"
@@ -104,6 +105,7 @@
                                 aria-expanded="false"
                                 aria-controls="search-results">
                         </button>
+                        <span id="main-search-instructions" class="sr-only">Search the OData site. Suggestions appear below as you type; use the up and down arrow keys to review suggestions and Enter to open the selected result.</span>
                     </div>
                 </form>
             </div>