diff --git a/fpga_architecture.xsd b/fpga_architecture.xsd
index 40855e0..3656cdf 100644
--- a/fpga_architecture.xsd
+++ b/fpga_architecture.xsd
@@ -1,4 +1,10 @@
 <?xml version="1.0"?>
+<!--
+  Copyright 2018 Jeppe Johansen
+
+  XML 1.0 Schema for the FPGA architecture description structure developed based on documentation here:
+  http://vtr-verilog-to-routing.readthedocs.io/en/latest/arch/index.html
+-->
 <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
 
   <xs:complexType name="port">
@@ -108,8 +114,8 @@
     <xs:complexContent>
       <xs:extension base="layout_info">
         <xs:attribute name="name" type="xs:string" use="required" />
-        <xs:attribute name="width " type="xs:int" use="required" />
-        <xs:attribute name="height " type="xs:int" use="required" />
+        <xs:attribute name="width" type="xs:int" use="required" />
+        <xs:attribute name="height" type="xs:int" use="required" />
       </xs:extension>
     </xs:complexContent>
   </xs:complexType>
diff --git a/packed_netlist.xsd b/packed_netlist.xsd
index e7c7cba..deba4d5 100644
--- a/packed_netlist.xsd
+++ b/packed_netlist.xsd
@@ -1,4 +1,10 @@
 <?xml version="1.0"?>
+<!--
+  Copyright 2018 Jeppe Johansen
+
+  XML 1.0 Schema for packed netlist format developed based on documentation here:
+  http://vtr-verilog-to-routing.readthedocs.io/en/latest/vpr/file_formats.html#packed-netlist-format-net
+-->
 <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
 
   <xs:complexType name="named_value">
diff --git a/routing_resource.xsd b/routing_resource.xsd
index 7d4ec5b..82314a2 100644
--- a/routing_resource.xsd
+++ b/routing_resource.xsd
@@ -1,4 +1,10 @@
 <?xml version="1.0"?>
+<!--
+  Copyright 2018 Jeppe Johansen
+
+  XML 1.0 Schema for rr_graph structure developed based on documentation here:
+  http://vtr-verilog-to-routing.readthedocs.io/en/latest/vpr/file_formats.html#routing-resource-graph-file-format-xml
+-->
 <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
 
   <xs:complexType name="channel">