diff --git a/tools/binman/README.entries b/tools/binman/README.entries
index bf8edce..97bfae1 100644
--- a/tools/binman/README.entries
+++ b/tools/binman/README.entries
@@ -60,7 +60,7 @@
 
 Properties / Entry arguments:
     - <xxx>-path: Filename containing the contents of this entry (optional,
-        defaults to 0)
+        defaults to None)
 
 where <xxx> is the blob_fname argument to the constructor.
 
@@ -691,6 +691,11 @@
     name-prefix: Adds a prefix to the name of every entry in the section
         when writing out the map
 
+Properties:
+    _allow_missing: True if this section permits external blobs to be
+        missing their contents. The second will produce an image but of
+        course it will not work.
+
 Since a section is also an entry, it inherits all the properies of entries
 too.