diff --git a/MANUAL.txt b/MANUAL.txt
index 902f131f2..7f22023e7 100644
--- a/MANUAL.txt
+++ b/MANUAL.txt
@@ -2518,6 +2518,18 @@ For headerless tables, the colons go on the top line instead:
     | Right         | Left          | Centered           |
     +---------------+---------------+--------------------+
 
+##### Grid Table Limitations #####
+
+Pandoc does not support grid tables with row spans or column spans.
+This means that neither variable numbers of columns across rows nor
+variable numbers of rows across columns are supported by Pandoc.
+All grid tables must have the same number of columns in each row,
+and the same number of rows in each column.  For example, the
+Docutils [sample grid tables] will not render as expected with
+Pandoc.
+
+[sample grid tables]: http://docutils.sourceforge.net/docs/ref/rst/restructuredtext.html#grid-tables
+
 
 #### Extension: `pipe_tables` ####