Fix documentation and CMakeLists

CMakeLists.txt

@@ -73,11 +73,11 @@ ADD_REQUIRED_DEPENDENCY("hpp-fcl >= 0.2.9")
 # Compile documentation
 CONFIGURE_FILE(doc/main.hh.in doc/main.hh)
 
-# Add dependency toward hpp-model library in pkg-config file.
-PKG_CONFIG_APPEND_LIBS("hpp-model")
-
 ADD_SUBDIRECTORY(src)
 ADD_SUBDIRECTORY(tests)
 
+# Add dependency toward hpp-model library in pkg-config file.
+PKG_CONFIG_APPEND_LIBS("hpp-model")
+
 SETUP_PROJECT_FINALIZE()
 SETUP_PROJECT_CPACK()

include/hpp/model/configuration.hh

@@ -86,8 +86,10 @@ namespace hpp {
     /// \param q1 first configuration,
     /// \param q2 second configuration,
     /// \retval result difference as a vector \f$\textbf{v}\f$ such that
-    /// q2 is the result of method integrate from q1 with vector
+    /// q1 is the result of method integrate from q2 with vector
     /// \f$\textbf{v}\f$
+    /// \note If the configuration space is a vector space, this is
+    /// \f$\textbf{v} = q_1 - q_2\f$
     void inline difference (const DevicePtr_t& robot, ConfigurationIn_t q1,
 			    ConfigurationIn_t q2, vectorOut_t result)
     {