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diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt
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@@ -799,6 +799,11 @@ Linux 2.4 IA64 Intel y n y n y y y
Known Problems
==============
+* On IRIX6.5, when C compiler version >7.4, the complicate MPI derived data type
+ code will work. However, the user should be aware to enlarge MPI_TYPE_MAX environment
+ variable to some certian value in order to use collective irregular selection code.
+ For example, the current parallel HDF5 test needs to enlarge MPI_TYPE_MAX to
+ 200,000 to make the test pass.
* The dataset created or rewritten with the v1.6.3 library or after can't
be read with the v1.6.2 library or before when Fletcher32 EDC(filter) is
enabled. There was a bug in the calculating code of the Fletcher32