diff --git a/whisper5/doc.go b/whisper5/doc.go
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+// Copyright 2014 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+/*
+Package whisper implements the Whisper PoC-1.
+
+(https://github.com/ethereum/wiki/wiki/Whisper-PoC-1-Protocol-Spec)
+
+Whisper combines aspects of both DHTs and datagram messaging systems (e.g. UDP).
+As such it may be likened and compared to both, not dissimilar to the
+matter/energy duality (apologies to physicists for the blatant abuse of a
+fundamental and beautiful natural principle).
+
+Whisper is a pure identity-based messaging system. Whisper provides a low-level
+(non-application-specific) but easily-accessible API without being based upon
+or prejudiced by the low-level hardware attributes and characteristics,
+particularly the notion of singular endpoints.
+*/
+package whisper5
+
+import "time"
+
+const (
+	statusCode   = 0x00
+	messagesCode = 0x01
+
+	protocolVersion    uint64 = 5
+	protocolVersionStr        = "5.0"
+	protocolName              = "shh"
+
+	signatureFlag = byte(1 << 7)
+	paddingFlag   = byte(1 << 6)
+
+	signatureLength = 65
+	maxPadLength    = 256 // must not exceed 256
+	aesKeyLength    = 32
+	saltLength      = 12
+	kdfIterations   = 4096
+	msgMaxLength    = 0xFFFF
+
+	expirationCycle   = 800 * time.Millisecond
+	transmissionCycle = 300 * time.Millisecond
+
+	DefaultTTL = 50 * time.Second
+	DefaultPoW = 50 * time.Millisecond
+)
+
+type TopicType [4]byte