diff --git a/Intrinsics_Reference/ch_intro.xml b/Intrinsics_Reference/ch_intro.xml
index fbe1901..c9e0b5e 100644
--- a/Intrinsics_Reference/ch_intro.xml
+++ b/Intrinsics_Reference/ch_intro.xml
@@ -234,7 +234,9 @@ xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="section_intro">
AltiVec Technology Program Interface
Manual.
- https://www.nxp.com/docs/en/reference-manual/ALTIVECPIM.pdf
+
+ https://www.nxp.com/docs/en/reference-manual/ALTIVECPIM.pdf
@@ -244,7 +246,9 @@ xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="section_intro">
Intel Architecture Instruction Set Extensions and
Future Features Programming Reference.
- https://software.intel.com/sites/default/files/managed/c5/15/architecture-instruction-set-extensions-programming-reference.pdf
+
+ https://software.intel.com/sites/default/files/managed/c5/15/architecture-instruction-set-extensions-programming-reference.pdf
@@ -272,7 +276,9 @@ xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="section_intro">
Using the GNU Compiler Collection.
- https://gcc.gnu.org/onlinedocs/gcc.pdf
+
+ https://gcc.gnu.org/onlinedocs/gcc.pdf