--- a/doc/interpreter/expr.txi
+++ b/doc/interpreter/expr.txi
@@ -153,6 +153,8 @@
 particularly for large matrices because Octave does not have to
 repeatedly resize the result.
 
+@DOCSTRING(subsref)
+
 @DOCSTRING(sub2ind)
 
 @DOCSTRING(ind2sub)
@@ -555,6 +557,10 @@
 function, not with the comparison operators listed above.
 @xref{Strings}.
 
+@DOCSTRING(isequal)
+
+@DOCSTRING(isequalwithequalnans)
+
 @node Boolean Expressions
 @section Boolean Expressions
 @cindex expressions, boolean
@@ -901,6 +907,8 @@
 programs hard to read.  Except in a one-shot program, you should rewrite
 it to get rid of such nesting of assignments.  This is never very hard.
 
+@DOCSTRING(subsasgn)
+
 @cindex increment operator
 @cindex decrement operator
 @cindex operators, increment