diff --git a/.envrc b/.envrc
index 989115f..0e1023d 100644
--- a/.envrc
+++ b/.envrc
@@ -36,7 +36,8 @@ use_guix()
     PACKAGES=(
         autoconf autoconf-archive automake libtool
         make cmake gcc-toolchain pkg-config patchelf
-        weechat xz libxml2 libstrophe json-c
+        weechat libxml2 libstrophe
+        glib libsignal-protocol-c sqlite
     )
 
     # Thanks <https://lists.gnu.org/archive/html/guix-devel/2016-09/msg00859.html>
diff --git a/.gitmodules b/.gitmodules
index e69de29..88ff237 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "axc"]
+	path = axc
+	url = https://github.com/gkdr/axc
diff --git a/Makefile b/Makefile
index b452cdd..1979980 100644
--- a/Makefile
+++ b/Makefile
@@ -14,28 +14,32 @@ LIBDIR ?= $(PREFIX)/lib
 INSTALL ?= /usr/bin/install
 
 SRCS=plugin.c \
-	 account.c \
-	 buffer.c \
-	 channel.c \
-	 command.c \
-	 config.c \
-	 connection.c \
-	 input.c \
-	 message.c \
-	 user.c \
-
-DEPS=
+     account.c \
+     buffer.c \
+     channel.c \
+     command.c \
+     config.c \
+     connection.c \
+     input.c \
+     message.c \
+     user.c \
+
+DEPS=axc/build/libaxc.a
 OBJS=$(subst .c,.o,$(SRCS))
 
 all: weechat-xmpp
 weechat-xmpp: $(DEPS) xmpp.so
 
-xmpp.so: $(OBJS)
-	$(CC) $(LDFLAGS) -o xmpp.so $(OBJS) $(LDLIBS)
+xmpp.so: $(OBJS) $(DEPS)
+	$(CC) $(LDFLAGS) -o xmpp.so $(OBJS) $(DEPS) $(LDLIBS)
 	which patchelf >/dev/null && \
 		patchelf --set-rpath $(LIBRARY_PATH):$(shell realpath $(shell dirname $(shell gcc --print-libgcc-file-name))/../../../) xmpp.so && \
 		patchelf --shrink-rpath xmpp.so || true
 
+axc/build/libaxc.a:
+	$(MAKE) -C axc
+axc: axc/build/libaxc.a
+
 test: xmpp.so
 	env LD_PRELOAD=$(DEBUG) \
 		weechat -a -P 'alias,buflist,irc' -r '/plugin load ./xmpp.so'
@@ -55,6 +59,10 @@ tidy:
 
 clean:
 	$(RM) $(OBJS)
+	$(MAKE) -C axc clean
+	git submodule foreach --recursive git clean -xfd || true
+	git submodule foreach --recursive git reset --hard || true
+	git submodule update --init --recursive || true
 
 distclean: clean
 	$(RM) *~ .depend
diff --git a/README.org b/README.org
index d93dc88..6b5244d 100644
--- a/README.org
+++ b/README.org
@@ -81,20 +81,26 @@
    * [X] Opening PMs (/chat)
 ** TODO [#A] Implement essential functionality (milestone v0.2)
    * [X] Opening PMs with initial message
-   * [ ] Handle wide errors gracefully
+   * [ ] [#B] Handle wide errors gracefully
    * [ ] MUCs
      * [X] Opening (/enter)
      * [X] Receiving
      * [X] Sending
+     * [ ] [#B] Edits
      * [ ] [#B] Handle errors gracefully
      * [ ] [#B] Presence/nicklist
-     * [ ] [#B] Show topic
-     * [ ] [#B] Edits
-   * [ ] OMEMO presence
-   * [ ] OMEMO messages
+       * [ ] [#B] Enters
+       * [ ] [#B] Leaves
+       * [ ] [#B] Tracking
+     * [ ] [#B] Set/show topic
+   * [ ] OMEMO (libsignal-protocol-c / axc)
+     * [ ] Presence
+     * [ ] Messages
    * [ ] MUC PMs
    * [ ] Send typing notifications
    * [ ] Recv typing notifications
+   * [ ] OTR (libotr)
+   * [ ] PGP (libgpgme)
 ** TODO [#C] Implement completion engine (milestone v0.3)
 ** TODO [#D] Close all issues (milestone v1.0)
 
diff --git a/axc b/axc
new file mode 160000
index 0000000..1d4454e
--- /dev/null
+++ b/axc
@@ -0,0 +1 @@
+Subproject commit 1d4454ea42d39a2064955f2a8de5f89787743f2a