diff --git a/README.md b/README.md
index 253a338..dd15ac7 100644
--- a/README.md
+++ b/README.md
@@ -1,70 +1,82 @@
 
 # Dependencies
 
 ## Core
 
 FFTW3_OMP, swig3, python(2|3), numpy, g++ with C++14 support
 
 ## Doc
 
 Doxygen, Mercurial
 
 # Build
 
+## First time building
+
+For the first build, you should compile Criterion, a library used for tests:
+
+    git submodule update --init --recursive
+    cd third-party/Criterion
+    mkdir build
+    cd build
+    cmake ..
+    cmake --build .
+    cd ../..
+
 The build system uses SCons. In order to construct the library you should hit:
 
     scons
 
 And to speedup the process you can do:
 
     scons -j 6
 
 In order to clean the build
 
     scons -c
 
 In order to compile in debug
 
     scons build_type=debug
 
 Indeed the default was
 
     scons build_type=release
 
 In order to make the compilation more verbose
 
     scons verbose=true
 
 For a list of all compilation options:
 
     scons -h
 
 You can customize a few compilation variables:
 -   `CXX` changes the compiler
 -   `CXXFLAGS` adds flags to the compilation process
 
 For example:
 -   `scons CXX=icpc` compiles with the intel C++ compiler
 -   `CXXFLAGS=-mavx2 scons` adds the `-mavx2` flag (which enables some Intel instructions) to the compilation process
 
 If the `CXX` variable is defined in your environment, `scons` will take it as a default compiler.
 
 ## Build the doxygen
 
    scons build_doc=true
 
 # Coding
 
 ## Python
 
 Tamaas is mainly used through the python interface. An example can be found in `examples/new_contact.py`
 
 ## C++
 
 TODO: update the example
 
 # Paralellism
 
 Tamaas features shared-memory paralellism with OpenMP. The number of threads can be
 controlled via the `OMP_NUM_THREADS` environment variable or the `omp_set_num_thread()`
 function in the OpenMP API.
diff --git a/third-party/Criterion b/third-party/Criterion
index b90931d..514b4d8 160000
--- a/third-party/Criterion
+++ b/third-party/Criterion
@@ -1 +1 @@
-Subproject commit b90931d379aea5644dc9d438e98a4c8fc506bf76
+Subproject commit 514b4d820e2f8fb4daa2b95b69c981853656cb73