diff --git a/doc/0.getting_started.md b/doc/0.getting_started.md
index 24cd98b..ef4f5e4 100644
--- a/doc/0.getting_started.md
+++ b/doc/0.getting_started.md
@@ -73,7 +73,11 @@ The available commands are:
 
 _Note:_ Fetching flats can be quite long and take up to a few minutes. This
 should be better optimized. To get a verbose output and have an hint about the
-progress, use the `-v` argument.
+progress, use the `-v` argument. It can remain stuck at "Loading flats for
+constraint XXX...", which simply means it is fetching flats (using WebOOB
+under the hood) and this step can be super long if there are lots of flats to
+fetch. If this happens to you, you can set `max_entries` in your config to
+limit the number of flats to fetch.
 
 
 ### Common arguments