diff --git a/m1r4/dsv/SUPPLEMENT b/m1r4/dsv/SUPPLEMENT
index c9a6afd..8b0b5a7 100644
--- a/m1r4/dsv/SUPPLEMENT
+++ b/m1r4/dsv/SUPPLEMENT
@@ -5,8 +5,11 @@
 # P	manufacturer part number (can be prefix or substring)
 # A	alias name (optional)
 # D	data sheet URL (optional, overrides)
+# X	delete part number
 #
-# Exactly one of C and P must be present.
+# X is always used alone. In all other cases, if P are absent, C must be
+# present. If both P and C are specified, the component references from
+# C are added to P.
 #
 
 # Part numbering scheme seems to have changed.
@@ -23,6 +26,9 @@ D: http://www.scpre.com.tw/Download.aspx?oid=1361
 P: C1005X5R0J105K
 D: http://www.tdk.com/pdf/general_B11.pdf
 
+P: C2012X5R0J475K
+D: http://www.tdk.com/pdf/general_B11.pdf
+
 P: AVR-M1005C080MTACB
 C: VR24, VR25, VR26, VR27, VR28, VR29, VR30, VR32, VR33
 D: http://www.tdk.co.jp/tefe02/e9c11_avr.pdf
@@ -51,3 +57,7 @@ D: http://www.ti.com/lit/ds/symlink/sn75hvd12.pdf
 
 P: TPS76301
 D: http://www.ti.com/lit/ds/symlink/tps76301.pdf
+
+# Mechanical components
+X: PN3
+X: HTS306