diff --git a/package_linter.py b/package_linter.py
index b0fab72..a68d4f9 100755
--- a/package_linter.py
+++ b/package_linter.py
@@ -874,6 +874,14 @@ class Script():
             if self.contains("source _common.sh") or self.contains("source ./_common.sh"):
                 print_warning("In the context of backup and restore script, you should load _common.sh with \"source ../settings/scripts/_common.sh\"")
 
+        # Usage of ynh_script_prorgression with --time or --weight=1 all over the place...
+        if self.containsregex(r"ynh_script_progression.*--time"):
+            print_warning("Using ynh_script_progression --time should only be for calibrating the weight (c.f. --weight). It's not meant to be kept for production versions.")
+        if self.containsregex(r"ynh_script_progression.*--weight=1") and \
+        not self.containsregex(r"ynh_script_progression.*--weight=([^1]|[1-9]{2})"):
+            print_warning("Having only '--weight=1' for ynh_script_progression is useless... Either calibrate the weights with --time once, or don't put any --weight at all.")
+
+
 
 def main():
     if len(sys.argv) != 2: