diff --git a/doc/obsolete/m_sizeof b/doc/obsolete/m_sizeof
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--- /dev/null
+++ b/doc/obsolete/m_sizeof
@@ -0,0 +1,21 @@
+
+     **********************************************************
+     *  ACHTUNG: EFUN EXISTIERT NICHT MEHR! NICHT VERWENDEN!  *
+     **********************************************************
+
+SYNOPSIS:
+	int sizeof(mapping map)
+
+DESCRIPTION:
+	Return the number of indices in mapping 'map'.
+
+HISTORY
+  Since LDMud 3.2.9, not available if driver is compiled without
+    USE_DEPRECATED.
+  Removed in LDMud 3.3 and LP "03.02.1@150".
+
+SEE ALSO:
+	mappingp(E), mkmapping(E), m_indices,(E) m_values(E),
+	m_delete(E), widthof(E)
+
+29.10.2006 Zesstra