Clarify docs

README.md

@@ -24,6 +24,14 @@ yarn add react-minisearch
 
 There are three main ways to use `react-minisearch`: the `useMiniSearch` hook, the `withMiniSearch` higher-order component, or the `WithMiniSearch` wrapper component.
 
+All three way take the following arguments (or props for the wrapper component):
+
+  - The initial collection of documents to add to the index. Note: this is just
+    the initial collection, and mutating this argument won't cause reindexing.
+    To add or remove documents after initialization, use the functions
+    `add`/`addAll`/`remove`/`removeAll`/`discard`, etc.
+  - The `MiniSearch` configuration options
+
 #### Using the useMiniSearch hook:
 
 ```jsx

src/react-minisearch.tsx

@@ -22,7 +22,7 @@ export interface UseMiniSearch<T = any> {
   miniSearch: MiniSearch<T>
 }
 
-export function useMiniSearch<T = any> (documents: T[], options: Options<T>): UseMiniSearch<T> {
+export function useMiniSearch<T = any> (documents: readonly T[], options: Options<T>): UseMiniSearch<T> {
   const optionsRef = useRef(options)
   const miniSearchRef = useRef<MiniSearch<T>>(new MiniSearch<T>(options))
   const documentByIdRef = useRef<{ [key: string]: T }>({})
@@ -147,7 +147,7 @@ export function useMiniSearch<T = any> (documents: T[], options: Options<T>): Us
 
   useEffect(() => {
     utils.addAll(documents)
-  }, [utils]) // eslint-disable-line react-hooks/exhaustive-deps
+  }, []) // eslint-disable-line react-hooks/exhaustive-deps
 
   return {
     searchResults,