diff --git a/Documentation/keepalive.md b/Documentation/keepalive.md
new file mode 100644
index 000000000..118ac66d1
--- /dev/null
+++ b/Documentation/keepalive.md
@@ -0,0 +1,46 @@
+# Keepalive
+
+gRPC sends http2 pings on the transport to detect if the connection is down. If
+the ping is not acknowledged by the other side within a certain period, the
+connection will be close. Note that pings are only necessary when there's no
+activity on the connection.
+
+For how to configure keepalive, see
+https://godoc.org/google.golang.org/grpc/keepalive for the options.
+
+## What should I set?
+
+It should be sufficient for most users to set [client
+parameters](https://godoc.org/google.golang.org/grpc/keepalive) as a [dial
+option](https://godoc.org/google.golang.org/grpc#WithKeepaliveParams).
+
+## What will happen?
+
+(The behavior described here is specific for gRPC-go, it might be slightly
+different in other languages.)
+
+When there's no activity on a connection (note that an ongoing stream results in
+__no activity__ when there's no message being sent), after `Time`, a ping will
+be sent by the client and the server will send a ping ack when it gets the ping.
+Client will wait for `Timeout`, and check if there's any activity on the
+connection during this period (a ping ack is an activity).
+
+## What about server side?
+
+Server has similar `Time` and `Timeout` settings as client. Server can also
+configure connection max-age. See [server
+parameters](https://godoc.org/google.golang.org/grpc/keepalive#ServerParameters)
+for details.
+
+### Enforcement policy
+
+[Enforcement
+policy](https://godoc.org/google.golang.org/grpc/keepalive#ServerParameters) is
+a special setting on server side to protect server from malicious or misbehaving
+clients.
+
+Server sends GOAWAY with ENHANCE_YOUR_CALM and close the connection when bad
+behaviors are detected:
+ - Client sends too frequent pings
+ - Client sends pings when there's no stream and this is disallowed by server
+   config
diff --git a/keepalive/keepalive.go b/keepalive/keepalive.go
index f8adc7e6d..78eea1fc9 100644
--- a/keepalive/keepalive.go
+++ b/keepalive/keepalive.go
@@ -16,7 +16,8 @@
  *
  */
 
-// Package keepalive defines configurable parameters for point-to-point healthcheck.
+// Package keepalive defines configurable parameters for point-to-point
+// healthcheck.
 package keepalive
 
 import (
@@ -24,42 +25,59 @@ import (
 )
 
 // ClientParameters is used to set keepalive parameters on the client-side.
-// These configure how the client will actively probe to notice when a connection is broken
-// and send pings so intermediaries will be aware of the liveness of the connection.
-// Make sure these parameters are set in coordination with the keepalive policy on the server,
-// as incompatible settings can result in closing of connection.
+// These configure how the client will actively probe to notice when a
+// connection is broken and send pings so intermediaries will be aware of the
+// liveness of the connection. Make sure these parameters are set in
+// coordination with the keepalive policy on the server, as incompatible
+// settings can result in closing of connection.
 type ClientParameters struct {
-	// After a duration of this time if the client doesn't see any activity it pings the server to see if the transport is still alive.
+	// After a duration of this time if the client doesn't see any activity it
+	// pings the server to see if the transport is still alive.
 	Time time.Duration // The current default value is infinity.
-	// After having pinged for keepalive check, the client waits for a duration of Timeout and if no activity is seen even after that
-	// the connection is closed.
+	// After having pinged for keepalive check, the client waits for a duration
+	// of Timeout and if no activity is seen even after that the connection is
+	// closed.
 	Timeout time.Duration // The current default value is 20 seconds.
-	// If true, client runs keepalive checks even with no active RPCs.
+	// If true, client sends keepalive pings even with no active RPCs. If false,
+	// when there are no active RPCs, Time and Timeout will be ignored and no
+	// keepalive pings will be sent.
 	PermitWithoutStream bool // false by default.
 }
 
-// ServerParameters is used to set keepalive and max-age parameters on the server-side.
+// ServerParameters is used to set keepalive and max-age parameters on the
+// server-side.
 type ServerParameters struct {
-	// MaxConnectionIdle is a duration for the amount of time after which an idle connection would be closed by sending a GoAway.
-	// Idleness duration is defined since the most recent time the number of outstanding RPCs became zero or the connection establishment.
+	// MaxConnectionIdle is a duration for the amount of time after which an
+	// idle connection would be closed by sending a GoAway. Idleness duration is
+	// defined since the most recent time the number of outstanding RPCs became
+	// zero or the connection establishment.
 	MaxConnectionIdle time.Duration // The current default value is infinity.
-	// MaxConnectionAge is a duration for the maximum amount of time a connection may exist before it will be closed by sending a GoAway.
-	// A random jitter of +/-10% will be added to MaxConnectionAge to spread out connection storms.
+	// MaxConnectionAge is a duration for the maximum amount of time a
+	// connection may exist before it will be closed by sending a GoAway. A
+	// random jitter of +/-10% will be added to MaxConnectionAge to spread out
+	// connection storms.
 	MaxConnectionAge time.Duration // The current default value is infinity.
-	// MaxConnectinoAgeGrace is an additive period after MaxConnectionAge after which the connection will be forcibly closed.
+	// MaxConnectinoAgeGrace is an additive period after MaxConnectionAge after
+	// which the connection will be forcibly closed.
 	MaxConnectionAgeGrace time.Duration // The current default value is infinity.
-	// After a duration of this time if the server doesn't see any activity it pings the client to see if the transport is still alive.
+	// After a duration of this time if the server doesn't see any activity it
+	// pings the client to see if the transport is still alive.
 	Time time.Duration // The current default value is 2 hours.
-	// After having pinged for keepalive check, the server waits for a duration of Timeout and if no activity is seen even after that
-	// the connection is closed.
+	// After having pinged for keepalive check, the server waits for a duration
+	// of Timeout and if no activity is seen even after that the connection is
+	// closed.
 	Timeout time.Duration // The current default value is 20 seconds.
 }
 
-// EnforcementPolicy is used to set keepalive enforcement policy on the server-side.
-// Server will close connection with a client that violates this policy.
+// EnforcementPolicy is used to set keepalive enforcement policy on the
+// server-side. Server will close connection with a client that violates this
+// policy.
 type EnforcementPolicy struct {
-	// MinTime is the minimum amount of time a client should wait before sending a keepalive ping.
+	// MinTime is the minimum amount of time a client should wait before sending
+	// a keepalive ping.
 	MinTime time.Duration // The current default value is 5 minutes.
-	// If true, server expects keepalive pings even when there are no active streams(RPCs).
+	// If true, server allows keepalive pings even when there are no active
+	// streams(RPCs). If false, and client sends ping when there are no active
+	// streams, server will send GOAWAY and close the connection.
 	PermitWithoutStream bool // false by default.
 }