diff --git a/changelogs/fragments/collection_error_fix.yml b/changelogs/fragments/collection_error_fix.yml
new file mode 100644
index 00000000000..00f6c0876cb
--- /dev/null
+++ b/changelogs/fragments/collection_error_fix.yml
@@ -0,0 +1,2 @@
+minor_changes:
+- Provides additional information about collection namespace name restrictions (https://github.com/ansible/ansible/issues/65151).
diff --git a/lib/ansible/galaxy/collection.py b/lib/ansible/galaxy/collection.py
index b3e150fb0af..0569605a3de 100644
--- a/lib/ansible/galaxy/collection.py
+++ b/lib/ansible/galaxy/collection.py
@@ -454,7 +454,10 @@ def validate_collection_name(name):
     if AnsibleCollectionRef.is_valid_collection_name(collection):
         return name
 
-    raise AnsibleError("Invalid collection name '%s', name must be in the format <namespace>.<collection>." % name)
+    raise AnsibleError("Invalid collection name '%s', "
+                       "name must be in the format <namespace>.<collection>. "
+                       "Please make sure namespace and collection name contains "
+                       "characters from [a-zA-Z0-9_] only." % name)
 
 
 @contextmanager
diff --git a/lib/ansible/utils/collection_loader.py b/lib/ansible/utils/collection_loader.py
index 81e3f4fac02..ec496524b5b 100644
--- a/lib/ansible/utils/collection_loader.py
+++ b/lib/ansible/utils/collection_loader.py
@@ -474,7 +474,7 @@ class AnsibleCollectionRef:
     @staticmethod
     def is_valid_collection_name(collection_name):
         """
-        Validates if is string is a well-formed collection name (does not look up the collection itself)
+        Validates if the given string is a well-formed collection name (does not look up the collection itself)
         :param collection_name: candidate collection name to validate (a valid name is of the form 'ns.collname')
         :return: True if the collection name passed is well-formed, False otherwise
         """