diff --git a/.travis.yml b/.travis.yml
index 592fbeda21..48a980aec2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -49,7 +49,8 @@ matrix:
       rust: 1.13.0
     - env: TARGET=arm-unknown-linux-gnueabi
       rust: 1.13.0
-    # - env: TARGET=arm-unknown-linux-musleabi
+    - env: TARGET=arm-unknown-linux-musleabi
+      rust: 1.13.0
     - env: TARGET=armv7-unknown-linux-gnueabihf
       rust: 1.13.0
     - env: TARGET=i686-unknown-linux-gnu
@@ -58,8 +59,10 @@ matrix:
       rust: 1.13.0
     - env: TARGET=mips-unknown-linux-gnu
       rust: 1.13.0
-    # - env: TARGET=mips64-unknown-linux-gnuabi64
-    # - env: TARGET=mips64el-unknown-linux-gnuabi64
+    - env: TARGET=mips64-unknown-linux-gnuabi64
+      rust: 1.13.0
+    - env: TARGET=mips64el-unknown-linux-gnuabi64
+      rust: 1.13.0
     - env: TARGET=mipsel-unknown-linux-gnu
       rust: 1.13.0
     - env: TARGET=powerpc-unknown-linux-gnu
@@ -68,7 +71,8 @@ matrix:
       rust: 1.13.0
     - env: TARGET=powerpc64le-unknown-linux-gnu
       rust: 1.13.0
-    # - env: TARGET=s390x-unknown-linux-gnu
+    - env: TARGET=s390x-unknown-linux-gnu
+      rust: 1.13.0
     - env: TARGET=x86_64-unknown-linux-gnu
       rust: 1.13.0
     - env: TARGET=x86_64-unknown-linux-musl
@@ -121,6 +125,16 @@ matrix:
       rust: 1.13.0
       os: osx
 
+    # Planning to add these targets, but they can fail for now
+    - env: TARGET=mips64-unknown-linux-gnuabi64
+      rust: 1.13.0
+    - env: TARGET=mips64el-unknown-linux-gnuabi64
+      rust: 1.13.0
+    - env: TARGET=arm-unknown-linux-musleabi
+      rust: 1.13.0
+    - env: TARGET=s390x-unknown-linux-gnu
+      rust: 1.13.0
+
     # Failures for nightlies may be because of compiler bugs, so don't fail the
     # build if these fail.
     - env: TARGET=x86_64-unknown-linux-gnu
diff --git a/README.md b/README.md
index 344b4eef18..8392207146 100644
--- a/README.md
+++ b/README.md
@@ -77,9 +77,13 @@ Tier 2:
 
 Tier 3:
   * aarch64-apple-ios
+  * arm-unknown-linux-musleabi
   * armv7-apple-ios
   * armv7s-apple-ios
   * i386-apple-ios
+  * mips64-unknown-linux-gnuabi64
+  * mips64el-unknown-linux-gnuabi64
+  * s390x-unknown-linux-gnu
   * x86_64-apple-ios
 
 ## Usage