diff --git a/libquadmath/ChangeLog b/libquadmath/ChangeLog
index 213233abae6fadbed0e1c4a56f728d1aba3c66cd..72e24ea2f71d17705e331bc24cf2f0f22e918e1b 100644
--- a/libquadmath/ChangeLog
+++ b/libquadmath/ChangeLog
@@ -1,3 +1,8 @@
+2013-01-22  Jakub Jelinek  <jakub@redhat.com>
+
+	PR libquadmath/56072
+	* libquadmath.texi (M_PI_2q, M_PI_4q): Fix up description.
+
 2012-12-13  Jakub Jelinek  <jakub@redhat.com>
 
 	* math/cbrtq.c (cbrtq): Use Q suffixed floating point constants
diff --git a/libquadmath/libquadmath.texi b/libquadmath/libquadmath.texi
index 4dff6665bd173202cdeb2a74ebfa2f9a670768bc..5f80d2b08c5db6f536d1ce3579920d18d9a8ba2b 100644
--- a/libquadmath/libquadmath.texi
+++ b/libquadmath/libquadmath.texi
@@ -6,7 +6,7 @@
 @c %**end of header
 
 @copying
-Copyright @copyright{} 2010, 2011 Free Software Foundation, Inc.
+Copyright @copyright{} 2010-2013 Free Software Foundation, Inc.
 
 @quotation
 Permission is granted to copy, distribute and/or modify this document
@@ -123,8 +123,8 @@ The following mathematical constants of type @code{__float128} are defined.
 @item @code{M_LN2q}: natural logarithm of 2
 @item @code{M_LN10q}: natural logarithm of 10
 @item @code{M_PIq}: pi
-@item @code{M_PI_2q}: two pi
-@item @code{M_PI_4q}: four pi
+@item @code{M_PI_2q}: pi divided by two
+@item @code{M_PI_4q}: pi divided by four
 @item @code{M_1_PIq}: one over pi
 @item @code{M_2_PIq}: one over two pi
 @item @code{M_2_SQRTPIq}: two over square root of pi