diff --git a/packetbeat/docs/fields.asciidoc b/packetbeat/docs/fields.asciidoc
index 7afb49a10eb7..2383c6bff913 100644
--- a/packetbeat/docs/fields.asciidoc
+++ b/packetbeat/docs/fields.asciidoc
@@ -109,7 +109,7 @@ Messages from Packetbeat itself. This field usually contains error messages for
 
 
 [[exported-fields-icmp]]
-=== ICMP fields
+=== ICMP Fields
 
 ICMP specific event fields.
 
@@ -118,6 +118,12 @@ ICMP specific event fields.
 
 The version of the ICMP protocol.
 
+==== icmp.request.message
+
+type: string
+
+A human readable form of the request.
+
 ==== icmp.request.type
 
 type: int
@@ -130,6 +136,12 @@ type: int
 
 The request code.
 
+==== icmp.response.message
+
+type: string
+
+A human readable form of the response.
+
 ==== icmp.response.type
 
 type: int