diff --git a/docs/guide/installation.md b/docs/guide/installation.md
index 9f8b26da0..2bbdfb110 100644
--- a/docs/guide/installation.md
+++ b/docs/guide/installation.md
@@ -206,6 +206,10 @@ poetry add setuptools wheel
 ./venv/bin/pip install setuptools wheel
 ```
 
+#### Poetry
+
+If your Poetry version is older than 1.2, for `poetry install`, ignore the `--only main` flag.
+
 ### Optional: PostgreSQL database
 
 If you want to use LNbits at scale, we recommend using PostgreSQL as the backend database. Install Postgres and setup a database for LNbits: