diff --git a/app/scodoc/sco_tag_module.py b/app/scodoc/sco_tag_module.py
index 7ab9d04a1..3c62fd553 100644
--- a/app/scodoc/sco_tag_module.py
+++ b/app/scodoc/sco_tag_module.py
@@ -106,7 +106,7 @@ class ScoTag(object):
         """
         if not title or len(title) > 32:
             return False
-        if re.match(r"^[A-Za-z0-9\-_$!\.]*(:[0-9]*)?$", title):
+        if re.match(r"^[\w0-9\-_$!?+=,&\.]*(:[0-9]*)?$", title):
             return True
         return False
 
@@ -259,6 +259,7 @@ def module_tag_set(module_id="", taglist=None):
     # Check tags syntax
     for tag in taglist:
         if not ScoTag.check_tag_title(tag):
+            log(f"module_tag_set({module_id}): invalid tag title")
             return scu.json_error(404, "invalid tag")
 
     # TODO code à moderniser (+ revoir classe ScoTag, utiliser modèle)