diff --git a/ChangeLog b/ChangeLog
index 02ccdac..1af3888 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,20 @@
+2016-12-04: Ver 0.2-5
+  * Patch zeromq checking return code problem for sodium_init().
+    See the discussion at https://github.com/zeromq/libzmq/issues/1632 and
+    https://github.com/zeromq/libzmq/issues/1635 . This causes warning to stop
+    because changes were made in new version of libsodium.
+
+curve_client.cpp: In constructor 'zmq::curve_client_t::curve_client_t(const zmq::options_t&)':
+curve_client.cpp:51:18: error: ignoring return value of 'int sodium_init()', declared with attribute warn_unused_result [-Werror=unused-result]
+     sodium_init();
+                  ^
+cc1plus: all warnings being treated as errors
+Makefile:728: recipe for target 'libzmq_la-curve_client.lo' failed
+make[2]: *** [libzmq_la-curve_client.lo] Error 1
+
+    The patch is based on
+    https://github.com/zeromq/libzmq/commit/479db2113643e459c11db392e0fefd6400657c9e .
+
 2016-08-06: Ver 0.2-4
   * Export zmq header files.
   * Add get.zmq.cppflags() and get.zmq.ldflags() to "R/get_conf.r".
diff --git a/DESCRIPTION b/DESCRIPTION
index 3f1aa68..9dc6216 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: pbdZMQ
-Version: 0.2-4
-Date: 2016-09-21
+Version: 0.2-5
+Date: 2016-12-04
 Title: Programming with Big Data -- Interface to ZeroMQ
 Authors@R: c(person("Wei-Chen", "Chen", role = c("aut", "cre"), email =
         "wccsnow@gmail.com"),
@@ -16,6 +16,7 @@ Authors@R: c(person("Wei-Chen", "Chen", role = c("aut", "cre"), email =
         person("Philipp", "A.", role = "ctb", comment = "Fedora"))
 Depends: R (>= 3.0.0)
 Imports: R6
+Enhances: pbdRPC, remoter
 LazyLoad: yes
 LazyData: yes
 Copyright: See files AUTHORS, COPYING, COPYING.LESSER, and MAINTAINERS
@@ -37,3 +38,4 @@ BugReports: http://group.r-pbd.org/
 MailingList: Please send questions and comments regarding pbdR to
         RBigData@gmail.com
 NeedsCompilation: yes
+Maintainer: Wei-Chen Chen <wccsnow@gmail.com>
diff --git a/inst/doc/pbdZMQ-guide.Rnw b/inst/doc/pbdZMQ-guide.Rnw
index 88c0045..2eb2c47 100644
--- a/inst/doc/pbdZMQ-guide.Rnw
+++ b/inst/doc/pbdZMQ-guide.Rnw
@@ -12,15 +12,11 @@
 \author{
 \begin{minipage}{6in}
 \centering
-Wei-Chen Chen$^1$ and Drew Schmidt$^2$
+Wei-Chen Chen$^1$ and Drew Schmidt$^1$
 \end{minipage}
 \\
 \\
 $^1$pbdR Core Team \\
-\\
-$^2$Business Analytics and Statistics, \\
-University of Tennessee, \\
-Knoxville, TN, USA \\
 %\\
 %\\
 %\today
diff --git a/inst/doc/pbdZMQ-guide.pdf b/inst/doc/pbdZMQ-guide.pdf
index 102b22e..6efe629 100644
Binary files a/inst/doc/pbdZMQ-guide.pdf and b/inst/doc/pbdZMQ-guide.pdf differ
diff --git a/src/zmqsrc/src/curve_client.cpp b/src/zmqsrc/src/curve_client.cpp
index 6019c54..ccb5cf9 100644
--- a/src/zmqsrc/src/curve_client.cpp
+++ b/src/zmqsrc/src/curve_client.cpp
@@ -38,6 +38,7 @@ zmq::curve_client_t::curve_client_t (const options_t &options_) :
     cn_peer_nonce(1),
     sync()
 {
+    int rc;
     memcpy (public_key, options_.curve_public_key, crypto_box_PUBLICKEYBYTES);
     memcpy (secret_key, options_.curve_secret_key, crypto_box_SECRETKEYBYTES);
     memcpy (server_key, options_.curve_server_key, crypto_box_PUBLICKEYBYTES);
@@ -48,11 +49,12 @@ zmq::curve_client_t::curve_client_t (const options_t &options_) :
     randombytes(tmpbytes, 4);
 #else
     // todo check return code
-    sodium_init();
+    rc = sodium_init ();
+    zmq_assert (rc != -1);
 #endif
 
     //  Generate short-term key pair
-    const int rc = crypto_box_keypair (cn_public, cn_secret);
+    rc = crypto_box_keypair (cn_public, cn_secret);
     zmq_assert (rc == 0);
 }
 
diff --git a/src/zmqsrc/src/curve_server.cpp b/src/zmqsrc/src/curve_server.cpp
index a3c4243..4fc4417 100644
--- a/src/zmqsrc/src/curve_server.cpp
+++ b/src/zmqsrc/src/curve_server.cpp
@@ -42,6 +42,7 @@ zmq::curve_server_t::curve_server_t (session_base_t *session_,
     cn_peer_nonce(1),
     sync()
 {
+    int rc;
     //  Fetch our secret key from socket options
     memcpy (secret_key, options_.curve_secret_key, crypto_box_SECRETKEYBYTES);
     scoped_lock_t lock (sync);
@@ -51,11 +52,12 @@ zmq::curve_server_t::curve_server_t (session_base_t *session_,
     randombytes(tmpbytes, 4);
 #else
     // todo check return code
-    sodium_init();
+    rc = sodium_init ();
+    zmq_assert (rc != -1);
 #endif
 
     //  Generate short-term key pair
-    const int rc = crypto_box_keypair (cn_public, cn_secret);
+    rc = crypto_box_keypair (cn_public, cn_secret);
     zmq_assert (rc == 0);
 }
 
diff --git a/vignettes/pbdZMQ-guide.Rnw b/vignettes/pbdZMQ-guide.Rnw
index 88c0045..2eb2c47 100644
--- a/vignettes/pbdZMQ-guide.Rnw
+++ b/vignettes/pbdZMQ-guide.Rnw
@@ -12,15 +12,11 @@
 \author{
 \begin{minipage}{6in}
 \centering
-Wei-Chen Chen$^1$ and Drew Schmidt$^2$
+Wei-Chen Chen$^1$ and Drew Schmidt$^1$
 \end{minipage}
 \\
 \\
 $^1$pbdR Core Team \\
-\\
-$^2$Business Analytics and Statistics, \\
-University of Tennessee, \\
-Knoxville, TN, USA \\
 %\\
 %\\
 %\today
diff --git a/vignettes/pbdZMQ-include/01-copyright.tex b/vignettes/pbdZMQ-include/01-copyright.tex
index db3738d..256ec2e 100644
--- a/vignettes/pbdZMQ-include/01-copyright.tex
+++ b/vignettes/pbdZMQ-include/01-copyright.tex
@@ -1,7 +1,7 @@
 
 \null
 \vfill
-\copyright\ 2015-2016 Wei-Chen Chen and Drew Schmidt.
+\copyright\ 2015-2017 Wei-Chen Chen and Drew Schmidt.
 
 Permission is granted to make and distribute verbatim copies of
 this vignette and its source provided the copyright notice and
diff --git a/vignettes/pbdZMQ-include/05-cs.tex b/vignettes/pbdZMQ-include/05-cs.tex
index 0260a73..d786ef6 100644
--- a/vignettes/pbdZMQ-include/05-cs.tex
+++ b/vignettes/pbdZMQ-include/05-cs.tex
@@ -1,5 +1,5 @@
 \section[A Basic Client/Server]{A Basic Client/Server}
-\label{sec:backward}
+\label{sec:cs}
 \addcontentsline{toc}{section}{\thesection. A Basic Client/Server}