diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 15885512ed314dde94b1389e7a0c51eea3d7a0cf..3803760fc68389fa522d407758dabb9182b35303 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2008-01-16  Sebastian Pop  <sebastian.pop@amd.com>
+
+	PR testsuite/34821
+	* doc/invoke.texi: Document the dependence on pthread for fopenmp
+	and ftree-parallelize-loops.
+
 2008-01-17  Mircea Namolaru  <namolaru@il.ibm.com>
 
 	PR rtl-optimization/34826
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 5e41ec30f51b97f95b3a65dc0c4935afbd5b81c3..f864cb076da511916a458563ca580e19d6d38b34 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -1519,7 +1519,9 @@ freestanding and hosted environments.
 Enable handling of OpenMP directives @code{#pragma omp} in C/C++ and
 @code{!$omp} in Fortran.  When @option{-fopenmp} is specified, the
 compiler generates parallel code according to the OpenMP Application
-Program Interface v2.5 @w{@uref{http://www.openmp.org/}}.
+Program Interface v2.5 @w{@uref{http://www.openmp.org/}}.  This option
+implies @option{-pthread}, and thus is only supported on targets that
+have support for @option{-pthread}.
 
 @item -fms-extensions
 @opindex fms-extensions
@@ -5841,7 +5843,9 @@ Parallelize loops, i.e., split their iteration space to run in n threads.
 This is only possible for loops whose iterations are independent
 and can be arbitrarily reordered.  The optimization is only
 profitable on multiprocessor machines, for loops that are CPU-intensive,
-rather than constrained e.g. by memory bandwidth.
+rather than constrained e.g. by memory bandwidth.  This option
+implies @option{-pthread}, and thus is only supported on targets
+that have support for @option{-pthread}.
 
 @item -ftree-sra
 @opindex ftree-sra