diff --git a/opts.go b/opts.go
index 2959dfc..c63a954 100644
--- a/opts.go
+++ b/opts.go
@@ -14,8 +14,9 @@ import (
 
 // ServerOptions control the behaviour of a server created by NewServer.
 // A nil *ServerOptions provides sensible defaults.
+// It is safe to share server options among multiple server instances.
 type ServerOptions struct {
-	// If not nil, send debug logs here.
+	// If not nil, send debug text logs here.
 	Logger *log.Logger
 
 	// If not nil, the methods of this value are called to log each request
@@ -38,16 +39,16 @@ type ServerOptions struct {
 	// along to the given assigner.
 	DisableBuiltin bool
 
-	// Allows up to the specified number of goroutines to execute concurrently
-	// in request handlers. A value less than 1 uses runtime.NumCPU().  Note
-	// that this setting does not constrain order of issue.
+	// Allows up to the specified number of goroutines to execute in parallel in
+	// request handlers. A value less than 1 uses runtime.NumCPU().  Note that
+	// this setting does not constrain order of issue.
 	Concurrency int
 
 	// If set, this function is called with the method name and encoded request
 	// parameters received from the client, before they are delivered to the
 	// handler. Its return value replaces the context and argument values. This
 	// allows the server to decode context metadata sent by the client.
-	// If unset, ctx and params are used as given.
+	// If unset, context and parameters are used as given.
 	DecodeContext func(context.Context, string, json.RawMessage) (context.Context, json.RawMessage, error)
 
 	// If set, this function is called with the context and client request
@@ -62,7 +63,8 @@ type ServerOptions struct {
 	Metrics *metrics.M
 
 	// If nonzero this value as the server start time; otherwise, use the
-	// current time when Start is called.
+	// current time when Start is called. All servers created from the same
+	// options will share the same start time if one is set.
 	StartTime time.Time
 }
 
@@ -162,8 +164,8 @@ type ClientOptions struct {
 	// The function receives the client and the response that was cancelled.
 	// The hook can obtain the ID and error value from rsp.
 	//
-	// Note that the hook does not receive the client context, which has already
-	// ended by the time the hook is called.
+	// Note that the hook does not receive the request context, which has
+	// already ended by the time the hook is called.
 	OnCancel func(cli *Client, rsp *Response)
 }