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-rw-r--r--release_docs/RELEASE.txt4
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diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt
index 0398e4a..a23dbdf 100644
--- a/release_docs/RELEASE.txt
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@@ -893,6 +893,10 @@ Linux 2.4 IA64 Intel y n y n y y y
Known Problems
==============
+* On mpich 1.2.5 and 1.2.6, we found that if more than two processes
+ contribute no IO and the application asks to do IO with collective, we found
+ that when using 4 processors, a simple collective write will be hung
+ sometimes. This can be verified with t_mpi test under testpar.
* 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.