diff --git a/tox.ini b/tox.ini
index 01a5eb6fe3..d8fa0ad331 100644
--- a/tox.ini
+++ b/tox.ini
@@ -243,6 +243,8 @@ envlist =
 
     ; opentelemetry-instrumentation-grpc
     py3{8,9,10,11,12}-test-instrumentation-grpc
+    # see https://github.com/grpc/grpc/issues/29517
+    # pypy3-test-instrumentation-grpc
     lint-instrumentation-grpc
 
     ; opentelemetry-instrumentation-sqlalchemy