Document the STRICT keyword

doc/nasmdoc.src

@@ -187,7 +187,6 @@ Object File Format
 \IA{standard section names}{standardised section names}
 \IR{symbols, exporting from dlls} symbols, exporting from DLLs
 \IR{symbols, importing from dlls} symbols, importing from DLLs
-\IR{tasm} \c{TASM}
 \IR{test subdirectory} \c{test} subdirectory
 \IR{tlink} \c{TLINK}
 \IR{underscore, in c symbols} underscore, in C symbols
@@ -1480,6 +1479,26 @@ NASM supports no convenient synonym for this, though you can always
 invent one using the macro processor.
 
 
+\H{strict} \i\c{STRICT}: Inhibiting Optimization
+
+When compiling with the optimizer set to level 2 or higher (see
+\k{opt-On}), NASM will use size specifiers (\c{BYTE}, \c{WORD},
+\c{DWORD}, \c{QWORD}, or \c{TWORD}) strictly to choose the address- or
+operand-size of the instruction.  The keyword \c{STRICT} can be used
+to inhibit optimization and force a particular operand to be emitted
+in the specified size.  For example, with the optimizer on, and in
+\c{BITS 16} mode,
+
+\c         push dword 33
+
+is encoded in three bytes \c{66 6A 21}, whereas
+
+\c         push strict dword 33
+
+is encoded in six bytes, with a full dword immediate operand \c{66 68
+21 00 00 00}.
+
+
 \H{crit} \i{Critical Expressions}
 
 A limitation of NASM is that it is a \i{two-pass assembler}; unlike