diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -9,6 +9,8 @@ https://ewserver.di.unimi.it/gitlab/riccardopresotto/setup_test_sdp.git
 * Otherwise, take care to import the project as a Gradle Project
 
 * If required, trust the project and accept the Gradle auto-import
+ 
+* Wait until the Gradle indexing process ends (it may take a few seconds)
 
 * The testing files are located in the directory: *setup\_test\_sdp/src/main/java*