diff --git a/go.mod b/go.mod
index c228bf7ec6..be18cb3983 100644
--- a/go.mod
+++ b/go.mod
@@ -42,7 +42,7 @@ require (
 	github.com/hashicorp/raft v1.0.0 // indirect
 	github.com/hashicorp/vault/api v1.0.2
 	github.com/influxdata/cron v0.0.0-20191203200038-ded12750aac6
-	github.com/influxdata/flux v0.66.1-0.20200423173753-ffde07d2f718
+	github.com/influxdata/flux v0.66.1-0.20200424205807-acb73b61260f
 	github.com/influxdata/httprouter v1.3.1-0.20191122104820-ee83e2772f69
 	github.com/influxdata/influxql v0.0.0-20180925231337-1cbfca8e56b6
 	github.com/influxdata/pkg-config v0.2.0
diff --git a/go.sum b/go.sum
index 2da143b3e3..ee6275195c 100644
--- a/go.sum
+++ b/go.sum
@@ -244,8 +244,8 @@ github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NH
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
 github.com/influxdata/cron v0.0.0-20191203200038-ded12750aac6 h1:OtjKkeWDjUbyMi82C7XXy7Tvm2LXMwiBBXyFIGNPaGA=
 github.com/influxdata/cron v0.0.0-20191203200038-ded12750aac6/go.mod h1:XabtPPW2qsCg0tl+kjaPU+cFS+CjQXEXbT1VJvHT4og=
-github.com/influxdata/flux v0.66.1-0.20200423173753-ffde07d2f718 h1:U4/ATW5lXLWpJvOpiG4rQdw4wWXAhN4SDax/X9HmAyU=
-github.com/influxdata/flux v0.66.1-0.20200423173753-ffde07d2f718/go.mod h1:4PVm7oUSOMJgXbEsEZgHmWZRjIPtB6gF0F9et2i3+3w=
+github.com/influxdata/flux v0.66.1-0.20200424205807-acb73b61260f h1:xPHrcX8pKPUDJ8JRInK2LRbrD+14ORn+QfO+NGGb5Vo=
+github.com/influxdata/flux v0.66.1-0.20200424205807-acb73b61260f/go.mod h1:4PVm7oUSOMJgXbEsEZgHmWZRjIPtB6gF0F9et2i3+3w=
 github.com/influxdata/goreleaser v0.97.0-influx h1:jT5OrcW7WfS0e2QxfwmTBjhLvpIC9CDLRhNgZJyhj8s=
 github.com/influxdata/goreleaser v0.97.0-influx/go.mod h1:MnjA0e0Uq6ISqjG1WxxMAl+3VS1QYjILSWVnMYDxasE=
 github.com/influxdata/httprouter v1.3.1-0.20191122104820-ee83e2772f69 h1:WQsmW0fXO4ZE/lFGIE84G6rIV5SJN3P3sjIXAP1a8eU=
diff --git a/query/promql/internal/promqltests/go.mod b/query/promql/internal/promqltests/go.mod
index f2ccd8ef67..d1b0728a54 100644
--- a/query/promql/internal/promqltests/go.mod
+++ b/query/promql/internal/promqltests/go.mod
@@ -13,7 +13,7 @@ require (
 	github.com/google/go-cmp v0.4.0
 	github.com/google/uuid v1.1.1 // indirect
 	github.com/hashicorp/go-rootcerts v1.0.2 // indirect
-	github.com/influxdata/flux v0.66.1-0.20200423173753-ffde07d2f718
+	github.com/influxdata/flux v0.66.1-0.20200424205807-acb73b61260f
 	github.com/influxdata/influxdb/v2 v2.0.0-00010101000000-000000000000
 	github.com/influxdata/influxql v1.0.1 // indirect
 	github.com/influxdata/promql/v2 v2.12.0
diff --git a/query/promql/internal/promqltests/go.sum b/query/promql/internal/promqltests/go.sum
index e44807bf25..69b9518321 100644
--- a/query/promql/internal/promqltests/go.sum
+++ b/query/promql/internal/promqltests/go.sum
@@ -321,8 +321,8 @@ github.com/inconshreveable/mousetrap v1.0.0 h1:Z8tu5sraLXCXIcARxBp/8cbvlwVa7Z1NH
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
 github.com/influxdata/cron v0.0.0-20191203200038-ded12750aac6 h1:OtjKkeWDjUbyMi82C7XXy7Tvm2LXMwiBBXyFIGNPaGA=
 github.com/influxdata/cron v0.0.0-20191203200038-ded12750aac6/go.mod h1:XabtPPW2qsCg0tl+kjaPU+cFS+CjQXEXbT1VJvHT4og=
-github.com/influxdata/flux v0.66.1-0.20200423173753-ffde07d2f718 h1:U4/ATW5lXLWpJvOpiG4rQdw4wWXAhN4SDax/X9HmAyU=
-github.com/influxdata/flux v0.66.1-0.20200423173753-ffde07d2f718/go.mod h1:4PVm7oUSOMJgXbEsEZgHmWZRjIPtB6gF0F9et2i3+3w=
+github.com/influxdata/flux v0.66.1-0.20200424205807-acb73b61260f h1:xPHrcX8pKPUDJ8JRInK2LRbrD+14ORn+QfO+NGGb5Vo=
+github.com/influxdata/flux v0.66.1-0.20200424205807-acb73b61260f/go.mod h1:4PVm7oUSOMJgXbEsEZgHmWZRjIPtB6gF0F9et2i3+3w=
 github.com/influxdata/httprouter v1.3.1-0.20191122104820-ee83e2772f69 h1:WQsmW0fXO4ZE/lFGIE84G6rIV5SJN3P3sjIXAP1a8eU=
 github.com/influxdata/httprouter v1.3.1-0.20191122104820-ee83e2772f69/go.mod h1:pwymjR6SrP3gD3pRj9RJwdl1j5s3doEEV8gS4X9qSzA=
 github.com/influxdata/influxdb1-client v0.0.0-20191209144304-8bf82d3c094d/go.mod h1:qj24IKcXYK6Iy9ceXlo3Tc+vtHo9lIhSX5JddghvEPo=
diff --git a/storage/reads/datatypes/storage_common.pb.go b/storage/reads/datatypes/storage_common.pb.go
index 9cc244f9a7..5da1c60966 100644
--- a/storage/reads/datatypes/storage_common.pb.go
+++ b/storage/reads/datatypes/storage_common.pb.go
@@ -868,6 +868,9 @@ func (m *Capability) XXX_DiscardUnknown() {
 var xxx_messageInfo_Capability proto.InternalMessageInfo
 
 type CapabilitiesResponse struct {
+	// Capabilities contains the set of capabilities supported
+	// by the storage engine. It is a map of method names to
+	// the detailed capability information for the method.
 	Caps map[string]*Capability `protobuf:"bytes,1,rep,name=caps,proto3" json:"caps,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 }