diff --git a/Tests/Unit/TestNGMimeAddressHeaderFieldGenerator.m b/Tests/Unit/TestNGMimeAddressHeaderFieldGenerator.m
index 538cd2577..3a5fe5fdf 100644
--- a/Tests/Unit/TestNGMimeAddressHeaderFieldGenerator.m
+++ b/Tests/Unit/TestNGMimeAddressHeaderFieldGenerator.m
@@ -33,6 +33,7 @@
    objc compiler */
 - (void) test_generateDataForHeaderFieldNamed_value_
 {
+  /* TODO: The 2 last ones fail but are actually minor issues in NGMimeBlabla. */
   NSString *rawAddresses[]
     = { @"wolfgang@test.com",    // email alone
         @"<wolfgang@test.com>",  // email between brackets
diff --git a/Tests/Unit/TestSBJsonParser.m b/Tests/Unit/TestSBJsonParser.m
index cb596a645..b8e273b0a 100644
--- a/Tests/Unit/TestSBJsonParser.m
+++ b/Tests/Unit/TestSBJsonParser.m
@@ -81,7 +81,9 @@
                               
   result = [parser objectWithString: @"[ -1 ]"];
   testEquals (result, [NSArray arrayWithObject: [NSNumber numberWithInt: -1]]);
-                              
+  
+  /* TODO: the 2 following fail because NSDecimalNumber does not implement
+     "compare:" */
   result = [parser objectWithString: @"[ 12.3456 ]"];
   testEquals (result, [NSArray arrayWithObject: [NSNumber numberWithDouble: 12.3456]]);
 
diff --git a/Tests/Unit/TestiCalTimeZonePeriod.m b/Tests/Unit/TestiCalTimeZonePeriod.m
index eee42ab8e..4de750a31 100644
--- a/Tests/Unit/TestiCalTimeZonePeriod.m
+++ b/Tests/Unit/TestiCalTimeZonePeriod.m
@@ -42,6 +42,8 @@
 
 @implementation TestiCalTimeZonePeriod
 
+/* TODO: this test fails for obscure reasons, but test__occurenceForDate_byRRule_ does not, which
+   is a good sign */
 - (void) test_occurenceForDate_
 {
   NSString *periods[] = { (@"BEGIN:DAYLIGHT\r\n"