diff --git a/README.md b/README.md
index 066114bb9b811ffc2d49e05dd9a79c6ee0b30727..98f7e732c8830de600e086e8f45ba9b954606278 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,8 @@ https://ewserver.di.unimi.it/gitlab/riccardopresotto/setup_grpc.git
 
 * If required, trust the project and accept the Gradle auto-import
 
+* Wait until the Gradle indexing process ends (it may take a few seconds)
+
 * Compile the .proto files: 
 	1. Select from the menu bar **Build** -> **Rebuild Project**
 	2. Check if some files have been generated in the directory *setup_grpc/build/generated/source/proto/main/java*