diff --git a/man2/recv.2 b/man2/recv.2
index 884862a5e..45dba6b1d 100644
--- a/man2/recv.2
+++ b/man2/recv.2
@@ -403,8 +403,16 @@ if an error occurred.
 In the event of an error,
 .I errno
 is set to indicate the error.
-The return value will be 0 when the
-peer has performed an orderly shutdown.
+
+When a stream socket peer has performed an orderly shutdown,
+the return value will be 0 (the traditional "end-of-file" return).
+
+Datagram sockets in various domains (e.g., the UNIX and Internet domains)
+permit zero-length datagrams.
+When such a datagram is received, the return value is 0.
+
+The value 0 may also be returned if the requested number of bytes
+to receive from a stream socket was 0.
 .SH ERRORS
 These are some standard errors generated by the socket layer.
 Additional errors