diff --git a/modules/build_info.cmake b/modules/build_info.cmake
index 4aa117a..4cd4e39 100644
--- a/modules/build_info.cmake
+++ b/modules/build_info.cmake
@@ -1,7 +1,12 @@
 #.rst:
 #
-# Generates source code that echoes configuration and build
+# Generates source code that echoes configuration, version, and build
 # information to the program output.
+#
+# Example autocmake.cfg entry::
+#
+#   [build_info]
+#   source: https://github.com/scisoft/autocmake/raw/master/modules/build_info.cmake
 
 find_package(PythonInterp REQUIRED)
 
diff --git a/modules/mpi.cmake b/modules/mpi.cmake
index 285fd63..a214b33 100644
--- a/modules/mpi.cmake
+++ b/modules/mpi.cmake
@@ -1,10 +1,32 @@
+#.rst:
+#
+# Enables MPI support.
+#
+# Variables used::
+#
+#   ENABLE_MPI
+#   MPI_FOUND
+#
+# Variables modified (provided the corresponding language is enabled)::
+#
+#   CMAKE_Fortran_FLAGS
+#
+# Example autocmake.cfg entry::
+#
+#   [mpi]
+#   source: https://github.com/scisoft/autocmake/raw/master/modules/mpi.cmake
+#   docopt: --mpi Enable MPI parallelization [default: False].
+#   define: '-DENABLE_MPI=%s' % arguments['--mpi']
+
 option(ENABLE_MPI "Enable MPI parallelization" OFF)
 
 # on Cray configure with -D MPI_FOUND=1
 if(ENABLE_MPI AND NOT MPI_FOUND)
     find_package(MPI)
     if(MPI_FOUND)
-        set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} ${MPI_COMPILE_FLAGS}")
+        if(DEFINED CMAKE_Fortran_COMPILER_ID)
+            set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} ${MPI_COMPILE_FLAGS}")
+        endif()
         include_directories(${MPI_INCLUDE_PATH})
     else()
         message(FATAL_ERROR "-- You asked for MPI, but CMake could not find any MPI installation, check $PATH")
diff --git a/modules/omp.cmake b/modules/omp.cmake
index df16146..58f8e43 100644
--- a/modules/omp.cmake
+++ b/modules/omp.cmake
@@ -1,9 +1,38 @@
+#.rst:
+#
+# Enables OpenMP support.
+#
+# Variables used::
+#
+#   ENABLE_OPENMP
+#   OPENMP_FOUND
+#
+# Variables modified (provided the corresponding language is enabled)::
+#
+#   CMAKE_Fortran_FLAGS
+#   CMAKE_C_FLAGS
+#   CMAKE_CXX_FLAGS
+#
+# Example autocmake.cfg entry::
+#
+#   [omp]
+#   source: https://github.com/scisoft/autocmake/raw/master/modules/omp.cmake
+#   docopt: --omp Enable OpenMP parallelization [default: False].
+#   define: '-DENABLE_OPENMP=%s' % arguments['--omp']
+
 option(ENABLE_OPENMP "Enable OpenMP parallelization" OFF)
 
 if(ENABLE_OPENMP)
     find_package(OpenMP)
     if(OPENMP_FOUND)
-        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")
-        set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} ${OpenMP_C_FLAGS}")
+        if(DEFINED CMAKE_Fortran_COMPILER_ID)
+            set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} ${OpenMP_C_FLAGS}")
+        endif()
+        if(DEFINED CMAKE_C_COMPILER_ID)
+            set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")
+        endif()
+        if(DEFINED CMAKE_CXX_COMPILER_ID)
+            set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
+        endif()
     endif()
 endif()
diff --git a/modules/preprocessing.cmake b/modules/preprocessing.cmake
deleted file mode 100644
index 6c0d998..0000000
--- a/modules/preprocessing.cmake
+++ /dev/null
@@ -1,7 +0,0 @@
-set(CPP)
-
-# forward preprocessing directly to the code
-if(NOT "${CPP}" STREQUAL "")
-    add_definitions(${CPP})
-endif()
-
diff --git a/modules/python.cmake b/modules/python.cmake
index c499b48..976aa59 100644
--- a/modules/python.cmake
+++ b/modules/python.cmake
@@ -1 +1,14 @@
+#.rst:
+#
+# Detects Python interpreter.
+#
+# Variables set::
+#
+#   PYTHON_EXECUTABLE
+#
+# Example autocmake.cfg entry::
+#
+#   [python]
+#   source: https://github.com/scisoft/autocmake/raw/master/modules/python.cmake
+
 find_package(PythonInterp REQUIRED)
diff --git a/modules/safeguards.cmake b/modules/safeguards.cmake
index a354892..d7a83fe 100644
--- a/modules/safeguards.cmake
+++ b/modules/safeguards.cmake
@@ -20,8 +20,8 @@ endif()
 string(TOLOWER "${CMAKE_BUILD_TYPE}" cmake_build_type_tolower)
 string(TOUPPER "${CMAKE_BUILD_TYPE}" cmake_build_type_toupper)
 
-if(    NOT cmake_build_type_tolower STREQUAL "debug"
-   AND NOT cmake_build_type_tolower STREQUAL "release"
-   AND NOT cmake_build_type_tolower STREQUAL "relwithdebinfo")
+if(NOT cmake_build_type_tolower STREQUAL "debug" AND
+   NOT cmake_build_type_tolower STREQUAL "release" AND
+   NOT cmake_build_type_tolower STREQUAL "relwithdebinfo")
     message(FATAL_ERROR "Unknown build type \"${CMAKE_BUILD_TYPE}\". Allowed values are Debug, Release, RelWithDebInfo (case-insensitive).")
 endif()
diff --git a/modules/src.cmake b/modules/src.cmake
index 1abaddf..8df35d2 100644
--- a/modules/src.cmake
+++ b/modules/src.cmake
@@ -1,5 +1,10 @@
 #.rst:
 #
 # Adds ${PROJECT_SOURCE_DIR}/src as subdirectory containing CMakeLists.txt.
+#
+# Example autocmake.cfg entry::
+#
+#   [src]
+#   source: https://github.com/scisoft/autocmake/raw/master/modules/src.cmake
 
 add_subdirectory(${PROJECT_SOURCE_DIR}/src)
diff --git a/modules/version.cmake b/modules/version.cmake
index 518cfab..28fb4a8 100644
--- a/modules/version.cmake
+++ b/modules/version.cmake
@@ -9,6 +9,11 @@
 # Variables defined::
 #
 #   PROGRAM_VERSION
+#
+# Example autocmake.cfg entry::
+#
+#   [version]
+#   source: https://github.com/scisoft/autocmake/raw/master/modules/version.cmake
 
 if(EXISTS "${PROJECT_SOURCE_DIR}/VERSION")
     file(READ "${PROJECT_SOURCE_DIR}/VERSION" PROGRAM_VERSION)