diff --git a/test/pitytest11/src/PityUnit.hh b/test/pitytest11/src/PityUnit.hh
index 7877a7b..d5f3488 100644
--- a/test/pitytest11/src/PityUnit.hh
+++ b/test/pitytest11/src/PityUnit.hh
@@ -98,8 +98,8 @@ namespace pEp {
             void _createTransport();
 
             // Query
-            bool _isProcessUnit() const;
-            bool _isRootUnit() const;
+            bool _isProcessUnit() const; // true if it forks
+            bool _isRootUnit() const;    // true if has no parent
 
             std::string _rootUnitDir();
 
@@ -119,10 +119,11 @@ namespace pEp {
             static std::string _global_root_dir;
             std::map<const std::string, PityUnit<TestContext>&> _children; // map to guarantee uniqueness of sibling-names
             int procUnitNr;
-            static int procUnitsCount;                 // will be increased in everuy constructor
+            static int procUnitsCount;                 // will be increased in every constructor
             std::shared_ptr<PityTransport> _transport; //only ever read via transport()
             Endpoints _transport_endpoints;            // only ever access via transportEndpoints()
 
+            // fs-mutex to sync across processes
             std::shared_ptr<fs_mutex> _log_mutex = nullptr;
             // internal logging
             Adapter::pEpLog::pEpLogger& m4gic_logger_n4me = logger_debug;
diff --git a/test/pitytest11/src/PityUnit.hxx b/test/pitytest11/src/PityUnit.hxx
index 2c51375..2e6af92 100644
--- a/test/pitytest11/src/PityUnit.hxx
+++ b/test/pitytest11/src/PityUnit.hxx
@@ -517,15 +517,15 @@ namespace pEp {
                 case 0:
                     return Utils::Color::WHITE;
                 case 1:
-                    return Utils::Color::CYAN;
+                    return Utils::Color::GREEN;
                 case 2:
-                    return Utils::Color::MAGENTA;
+                    return Utils::Color::YELLOW;
                 case 3:
-                    return Utils::Color::BLUE;
+                    return Utils::Color::CYAN;
                 case 4:
-                    return Utils::Color::GREEN;
+                    return Utils::Color::BLUE;
                 case 5:
-                    return Utils::Color::YELLOW;
+                    return Utils::Color::MAGENTA;
                 case 6:
                     return Utils::Color::RED;
                 default:
@@ -542,6 +542,7 @@ namespace pEp {
         template<class TestContext>
         void PityUnit<TestContext>::_logRaw(const std::string &msg) const
         {
+            // fs-mutex to sync across processes
             _log_mutex->aquire();
             Adapter::pEpLog::log(msg, _termColor());
             _log_mutex->release();