diff --git a/README.md b/README.md
index 06cc0dc..e6097cd 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,12 @@ to do this you have to add it to your `lakefile.lean` like this:
 meta if get_config? env = some "dev" then -- dev is so not everyone has to build it
 require «doc-gen4» from git "https://github.com/leanprover/doc-gen4" @ "main"
 ```
+
+Then update your dependencies:
+```
+lake -Kenv=dev update
+```
+
 Then you can generate documentation for an entire library using:
 ```
 lake -Kenv=dev build Test:docs
@@ -31,4 +37,4 @@ need to serve them from a proper http server for it to work.  An easy way to do
 Note that if you modify the `.js` or `.css` files in doc-gen4, they won't necessarily be copied over when 
 you rebuild the documentation.  You can manually copy the changes to the `build/docs` directory to make
 sure the changes appear, or just do a full recompilation (`lake clean` and `lake build` inside the `doc-gen4`
-directory.)
\ No newline at end of file
+directory.)