diff --git a/CMakeLists.txt b/CMakeLists.txt
index d3ab9fc..3b03bf4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -27,6 +27,10 @@ set(TEST_SRC_FILES
     tests/passwordfiletests.cpp
 )
 
+set(DOC_FILES
+    README.md
+)
+
 # meta data
 set(META_PROJECT_NAME passwordfile)
 set(META_PROJECT_VARNAME PASSWORD_FILE)
@@ -36,10 +40,10 @@ set(META_APP_URL "https://github.com/${META_APP_AUTHOR}/${META_PROJECT_NAME}")
 set(META_APP_DESCRIPTION "C++ library to read/write passwords from/to encrypted files.")
 set(META_VERSION_MAJOR 3)
 set(META_VERSION_MINOR 1)
-set(META_VERSION_PATCH 1)
+set(META_VERSION_PATCH 2)
 
 # find c++utilities
-find_package(c++utilities 3.3.0 REQUIRED)
+find_package(c++utilities 4.0.0 REQUIRED)
 use_cpp_utilities()
 
 # find zlib
@@ -57,3 +61,4 @@ include(BasicConfig)
 include(WindowsResources)
 include(LibraryTarget)
 include(TestTarget)
+include(Doxygen)
diff --git a/io/passwordfile.cpp b/io/passwordfile.cpp
index dea70b8..2c6690b 100644
--- a/io/passwordfile.cpp
+++ b/io/passwordfile.cpp
@@ -245,6 +245,7 @@ void PasswordFile::load()
 /*!
  * \brief Writes the current root entry to the file.
  * \param useEncryption Specifies whether encryption should be used.
+ * \param useCompression Specifies whether compression should be used.
  * \throws Throws ios_base::failure when an IO error occurs.
  * \throws Throws runtime_error when no root entry is present.
  * \throws Throws Io::CryptoException when a decryption error occurs.
diff --git a/tests/passwordfiletests.cpp b/tests/passwordfiletests.cpp
index 064768b..477b3c6 100644
--- a/tests/passwordfiletests.cpp
+++ b/tests/passwordfiletests.cpp
@@ -13,6 +13,9 @@ using namespace Io;
 
 using namespace CPPUNIT_NS;
 
+/*!
+ * \brief The PasswordFileTests class tests the Io::PasswordFile class.
+ */
 class PasswordFileTests : public TestFixture
 {
     CPPUNIT_TEST_SUITE(PasswordFileTests);
diff --git a/util/openssl.cpp b/util/openssl.cpp
index aa63790..6b2b860 100644
--- a/util/openssl.cpp
+++ b/util/openssl.cpp
@@ -4,10 +4,19 @@
 #include <openssl/err.h>
 #include <openssl/evp.h>
 
+/*!
+ * \brief Contains utility classes and functions.
+ */
 namespace Util {
 
+/*!
+ * \brief Contains functions utilizing the usage of OpenSSL.
+ */
 namespace OpenSsl {
 
+/*!
+ * \brief Initializes OpenSSL.
+ */
 void init()
 {
     // load the human readable error strings for libcrypto
@@ -18,6 +27,9 @@ void init()
     OPENSSL_config(NULL);
 }
 
+/*!
+ * \brief Cleans resources of OpenSSL.
+ */
 void clean()
 {
     // removes all digests and ciphers