diff --git a/diylc/diylc-core/src/main/resources/update.xml b/diylc/diylc-core/src/main/resources/update.xml
index 0d4e640a6..10e39b763 100644
--- a/diylc/diylc-core/src/main/resources/update.xml
+++ b/diylc/diylc-core/src/main/resources/update.xml
@@ -669,6 +669,10 @@
 					<changeType>BUG_FIX</changeType>
 					<description>'Solder Pad' on the top layer put its solder mask opening on the bottom layer in Gerber export</description>
 				</org.diylc.appframework.update.Change>
+				<org.diylc.appframework.update.Change>
+					<changeType>BUG_FIX</changeType>
+					<description>Opening an older project with a perfboard or another board warned that the file references unknown component properties</description>
+				</org.diylc.appframework.update.Change>
 			</changes>
 			<url>https://github.com/bancika/diy-layout-creator/releases</url>
 		</org.diylc.appframework.update.Version>
diff --git a/diylc/diylc-library/src/main/java/org/diylc/components/boards/AbstractBoard.java b/diylc/diylc-library/src/main/java/org/diylc/components/boards/AbstractBoard.java
index 05368b3e3..47a485a5b 100644
--- a/diylc/diylc-library/src/main/java/org/diylc/components/boards/AbstractBoard.java
+++ b/diylc/diylc-library/src/main/java/org/diylc/components/boards/AbstractBoard.java
@@ -69,6 +69,10 @@ public abstract class AbstractBoard extends AbstractTransparentComponent<String>
   protected Color boardColor = PHENOLIC_COLOR;
   protected Color borderColor = BORDER_COLOR;
   protected Color coordinateColor = COORDINATE_COLOR;
+  // superseded by coordinateDisplay long ago and no longer read, but kept so that files which
+  // still carry it load without an unknown-property warning
+  @Deprecated
+  protected Boolean drawCoordinates = null;
   protected CoordinateType xType = CoordinateType.Numbers;
   protected CoordinateOrigin coordinateOrigin = CoordinateOrigin.Top_Left;
   protected CoordinateDisplay coordinateDisplay = CoordinateDisplay.One_Side;