diff --git a/slices/ca-certificates-java.yaml b/slices/ca-certificates-java.yaml
index 2c490695..6448d08d 100644
--- a/slices/ca-certificates-java.yaml
+++ b/slices/ca-certificates-java.yaml
@@ -7,7 +7,7 @@ slices:
   data:
     essential:
       - ca-certificates_data
-      - libnss3_libs
+      - libnss3_nss
     contents:
       /etc/default/cacerts:
       /etc/ssl/certs/java/:
diff --git a/slices/libnss3.yaml b/slices/libnss3.yaml
index d7e4bb81..db5c002e 100644
--- a/slices/libnss3.yaml
+++ b/slices/libnss3.yaml
@@ -1,10 +1,25 @@
+# Network Security Service libraries.
+#
+# This is a set of libraries designed to support cross-platform development of
+# security-enabled client and server applications. It can support SSLv2 and v4,
+# TLS, PKCS #5, #7, #11, #12, S/MIME, X.509 v3 certificates and other security
+# standards.
 package: libnss3
 
 essential:
   - libnss3_copyright
 
 slices:
+  # The libs slice contains all the libraries coming from this package.
   libs:
+    essential:
+      # This package still has many other libraries which are not part of any
+      # slices yet. Upon creation of new slices containing those libraries,
+      # make sure to add those slices in this list.
+      - libnss3_nss
+      - libnss3_smime
+
+  nss:
     essential:
       - libc6_libs
       - libnspr4_libs
@@ -13,6 +28,13 @@ slices:
       /usr/lib/*-linux-*/libnss3.so:
       /usr/lib/*-linux-*/libnssutil3.so:
 
+  smime:
+    essential:
+      - libc6_libs
+      - libnspr4_libs
+    contents:
+      /usr/lib/*-linux-*/libsmime3.so:
+
   copyright:
     contents:
       /usr/share/doc/libnss3/copyright: