diff --git a/releasenotes/notes/drop-DEFAULT_PARAMS-bfcc2e7b74ef880b.yaml b/releasenotes/notes/drop-DEFAULT_PARAMS-bfcc2e7b74ef880b.yaml
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index 0000000..c9a49a7
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+++ b/releasenotes/notes/drop-DEFAULT_PARAMS-bfcc2e7b74ef880b.yaml
@@ -0,0 +1,13 @@
+---
+upgrade:
+  - |
+    Replace any call in your code to credentials_factory.DEFAULT_PARAMS with
+    a call to config.service_client_config().
+fixes:
+  - |
+    The credentials_factory module used to load configuration at import time
+    which caused configuration being loaded at test discovery time.
+    This was fixed by removing the DEFAULT_PARAMS variable. This variable
+    was redundant (and outdated), the same dictionary (but up to date) can
+    be obtained via invoking config.service_client_config() with no service
+    parameter.