diff --git a/staging/src/k8s.io/apiextensions-apiserver/examples/client-go/pkg/client/informers/externalversions/factory.go b/staging/src/k8s.io/apiextensions-apiserver/examples/client-go/pkg/client/informers/externalversions/factory.go
index 6c473339eee..4ee8e863aa1 100644
--- a/staging/src/k8s.io/apiextensions-apiserver/examples/client-go/pkg/client/informers/externalversions/factory.go
+++ b/staging/src/k8s.io/apiextensions-apiserver/examples/client-go/pkg/client/informers/externalversions/factory.go
@@ -228,6 +228,7 @@ type SharedInformerFactory interface {
 
 	// Start initializes all requested informers. They are handled in goroutines
 	// which run until the stop channel gets closed.
+	// Warning: Start does not block. When run in a go-routine, it will race with a later WaitForCacheSync.
 	Start(stopCh <-chan struct{})
 
 	// Shutdown marks a factory as shutting down. At that point no new
diff --git a/staging/src/k8s.io/apiextensions-apiserver/pkg/client/informers/externalversions/factory.go b/staging/src/k8s.io/apiextensions-apiserver/pkg/client/informers/externalversions/factory.go
index 90319bd215a..a22336a31f6 100644
--- a/staging/src/k8s.io/apiextensions-apiserver/pkg/client/informers/externalversions/factory.go
+++ b/staging/src/k8s.io/apiextensions-apiserver/pkg/client/informers/externalversions/factory.go
@@ -228,6 +228,7 @@ type SharedInformerFactory interface {
 
 	// Start initializes all requested informers. They are handled in goroutines
 	// which run until the stop channel gets closed.
+	// Warning: Start does not block. When run in a go-routine, it will race with a later WaitForCacheSync.
 	Start(stopCh <-chan struct{})
 
 	// Shutdown marks a factory as shutting down. At that point no new
diff --git a/staging/src/k8s.io/client-go/informers/factory.go b/staging/src/k8s.io/client-go/informers/factory.go
index f2fef0e0b2e..86c24551ef9 100644
--- a/staging/src/k8s.io/client-go/informers/factory.go
+++ b/staging/src/k8s.io/client-go/informers/factory.go
@@ -247,6 +247,7 @@ type SharedInformerFactory interface {
 
 	// Start initializes all requested informers. They are handled in goroutines
 	// which run until the stop channel gets closed.
+	// Warning: Start does not block. When run in a go-routine, it will race with a later WaitForCacheSync.
 	Start(stopCh <-chan struct{})
 
 	// Shutdown marks a factory as shutting down. At that point no new
diff --git a/staging/src/k8s.io/code-generator/cmd/informer-gen/generators/factory.go b/staging/src/k8s.io/code-generator/cmd/informer-gen/generators/factory.go
index b59dc99e32b..b27cfeb0a3c 100644
--- a/staging/src/k8s.io/code-generator/cmd/informer-gen/generators/factory.go
+++ b/staging/src/k8s.io/code-generator/cmd/informer-gen/generators/factory.go
@@ -300,7 +300,7 @@ type SharedInformerFactory interface {
 	// Start initializes all requested informers. They are handled in goroutines
 	// which run until the stop channel gets closed.
 	// Warning: Start does not block. When run in a go-routine, it will race with a later WaitForCacheSync.
-        Start(stopCh <-chan struct{})
+	Start(stopCh <-chan struct{})
 
 	// Shutdown marks a factory as shutting down. At that point no new
 	// informers can be started anymore and Start will return without
diff --git a/staging/src/k8s.io/code-generator/examples/HyphenGroup/informers/externalversions/factory.go b/staging/src/k8s.io/code-generator/examples/HyphenGroup/informers/externalversions/factory.go
index 17c25f261a9..a3cd3f40e4b 100644
--- a/staging/src/k8s.io/code-generator/examples/HyphenGroup/informers/externalversions/factory.go
+++ b/staging/src/k8s.io/code-generator/examples/HyphenGroup/informers/externalversions/factory.go
@@ -228,6 +228,7 @@ type SharedInformerFactory interface {
 
 	// Start initializes all requested informers. They are handled in goroutines
 	// which run until the stop channel gets closed.
+	// Warning: Start does not block. When run in a go-routine, it will race with a later WaitForCacheSync.
 	Start(stopCh <-chan struct{})
 
 	// Shutdown marks a factory as shutting down. At that point no new
diff --git a/staging/src/k8s.io/code-generator/examples/MixedCase/informers/externalversions/factory.go b/staging/src/k8s.io/code-generator/examples/MixedCase/informers/externalversions/factory.go
index 9cefe3d0cc0..4628bbb862d 100644
--- a/staging/src/k8s.io/code-generator/examples/MixedCase/informers/externalversions/factory.go
+++ b/staging/src/k8s.io/code-generator/examples/MixedCase/informers/externalversions/factory.go
@@ -228,6 +228,7 @@ type SharedInformerFactory interface {
 
 	// Start initializes all requested informers. They are handled in goroutines
 	// which run until the stop channel gets closed.
+	// Warning: Start does not block. When run in a go-routine, it will race with a later WaitForCacheSync.
 	Start(stopCh <-chan struct{})
 
 	// Shutdown marks a factory as shutting down. At that point no new
diff --git a/staging/src/k8s.io/code-generator/examples/apiserver/informers/externalversions/factory.go b/staging/src/k8s.io/code-generator/examples/apiserver/informers/externalversions/factory.go
index a07237c90e4..5efa771d5eb 100644
--- a/staging/src/k8s.io/code-generator/examples/apiserver/informers/externalversions/factory.go
+++ b/staging/src/k8s.io/code-generator/examples/apiserver/informers/externalversions/factory.go
@@ -231,6 +231,7 @@ type SharedInformerFactory interface {
 
 	// Start initializes all requested informers. They are handled in goroutines
 	// which run until the stop channel gets closed.
+	// Warning: Start does not block. When run in a go-routine, it will race with a later WaitForCacheSync.
 	Start(stopCh <-chan struct{})
 
 	// Shutdown marks a factory as shutting down. At that point no new
diff --git a/staging/src/k8s.io/code-generator/examples/crd/informers/externalversions/factory.go b/staging/src/k8s.io/code-generator/examples/crd/informers/externalversions/factory.go
index 77e5c720e88..bdefa336fef 100644
--- a/staging/src/k8s.io/code-generator/examples/crd/informers/externalversions/factory.go
+++ b/staging/src/k8s.io/code-generator/examples/crd/informers/externalversions/factory.go
@@ -229,6 +229,7 @@ type SharedInformerFactory interface {
 
 	// Start initializes all requested informers. They are handled in goroutines
 	// which run until the stop channel gets closed.
+	// Warning: Start does not block. When run in a go-routine, it will race with a later WaitForCacheSync.
 	Start(stopCh <-chan struct{})
 
 	// Shutdown marks a factory as shutting down. At that point no new
diff --git a/staging/src/k8s.io/code-generator/examples/single/informers/externalversions/factory.go b/staging/src/k8s.io/code-generator/examples/single/informers/externalversions/factory.go
index f886fdf5e24..f282ac17b61 100644
--- a/staging/src/k8s.io/code-generator/examples/single/informers/externalversions/factory.go
+++ b/staging/src/k8s.io/code-generator/examples/single/informers/externalversions/factory.go
@@ -228,6 +228,7 @@ type SharedInformerFactory interface {
 
 	// Start initializes all requested informers. They are handled in goroutines
 	// which run until the stop channel gets closed.
+	// Warning: Start does not block. When run in a go-routine, it will race with a later WaitForCacheSync.
 	Start(stopCh <-chan struct{})
 
 	// Shutdown marks a factory as shutting down. At that point no new
diff --git a/staging/src/k8s.io/kube-aggregator/pkg/client/informers/externalversions/factory.go b/staging/src/k8s.io/kube-aggregator/pkg/client/informers/externalversions/factory.go
index 3cf42a74bd9..9774cfb8857 100644
--- a/staging/src/k8s.io/kube-aggregator/pkg/client/informers/externalversions/factory.go
+++ b/staging/src/k8s.io/kube-aggregator/pkg/client/informers/externalversions/factory.go
@@ -228,6 +228,7 @@ type SharedInformerFactory interface {
 
 	// Start initializes all requested informers. They are handled in goroutines
 	// which run until the stop channel gets closed.
+	// Warning: Start does not block. When run in a go-routine, it will race with a later WaitForCacheSync.
 	Start(stopCh <-chan struct{})
 
 	// Shutdown marks a factory as shutting down. At that point no new
diff --git a/staging/src/k8s.io/sample-apiserver/pkg/generated/informers/externalversions/factory.go b/staging/src/k8s.io/sample-apiserver/pkg/generated/informers/externalversions/factory.go
index 52c8c24219c..cc782bf7c01 100644
--- a/staging/src/k8s.io/sample-apiserver/pkg/generated/informers/externalversions/factory.go
+++ b/staging/src/k8s.io/sample-apiserver/pkg/generated/informers/externalversions/factory.go
@@ -228,6 +228,7 @@ type SharedInformerFactory interface {
 
 	// Start initializes all requested informers. They are handled in goroutines
 	// which run until the stop channel gets closed.
+	// Warning: Start does not block. When run in a go-routine, it will race with a later WaitForCacheSync.
 	Start(stopCh <-chan struct{})
 
 	// Shutdown marks a factory as shutting down. At that point no new
diff --git a/staging/src/k8s.io/sample-controller/pkg/generated/informers/externalversions/factory.go b/staging/src/k8s.io/sample-controller/pkg/generated/informers/externalversions/factory.go
index ccdfc8a8ff1..46b47b65762 100644
--- a/staging/src/k8s.io/sample-controller/pkg/generated/informers/externalversions/factory.go
+++ b/staging/src/k8s.io/sample-controller/pkg/generated/informers/externalversions/factory.go
@@ -228,6 +228,7 @@ type SharedInformerFactory interface {
 
 	// Start initializes all requested informers. They are handled in goroutines
 	// which run until the stop channel gets closed.
+	// Warning: Start does not block. When run in a go-routine, it will race with a later WaitForCacheSync.
 	Start(stopCh <-chan struct{})
 
 	// Shutdown marks a factory as shutting down. At that point no new