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diff --git a/docs/rmac.rst b/docs/rmac.rst
index d937ff5..a562e85 100644
--- a/docs/rmac.rst
+++ b/docs/rmac.rst
@@ -4,8 +4,8 @@ RMAC
 =====================
 Reference Manual
 ================
-version 2.0.8
-=============
+version 2.0.18
+==============
 
 © and notes
 ===========
@@ -17,7 +17,7 @@ the accuracy of printed or duplicated material after the date of publication and
 disclaims liability for changes, errors or omissions.*
 
 
-*Copyright © 2011-2019, Reboot*
+*Copyright © 2011-2020, Reboot*
 
 *All rights reserved.*
 
@@ -167,7 +167,7 @@ Switch               Description
 
                       `4: lea to addq`
 
-                      `5: Base displacement ([bd,An,Xn],od) etc to ([An,Xn],od)`
+                      `5: 68020+ Absolute long base/outer displacement to word`
 
                       `6: Convert null short branches to NOP`
 
@@ -902,12 +902,12 @@ code if the debugging code is referenced, as in:
 
                lea    string,a0            ; AO -> message
                jsr    debug                ; print a message
-               its                         ; and return
+               rts                         ; and return
         string: dc.b  "Help me, Spock!",0  ; (the message)
                     .
                     .
                     .
-               .iif ^^defined debug, .include "debug.s"
+               .iif ^^referenced debug, .include "debug.s"
 
 The **jsr** statement references the symbol debug. Near the end of the source file, the
 "**.iif**" statement includes the file "**debug.s**" if the symbol debug was referenced.
@@ -1530,12 +1530,22 @@ The assembler provides "creature comforts" when it processes 68000 mnemonics:
 
  * All optimisations are turned off for any source line that has an exclamation mark
    (*!*) on their first column.
- 
+
+ * Optimisation switches 0, 1 and 2 are turned on by default for legacy reasons.
+   All other levels are off by default. (refer to section `The Command Line`_
+   for a description of all the switches).
+
+ * Optimisation warnings are off by default. Invoke RMAC with the *-s* switch to
+   turn on warnings in console and listing output.
+
+ * In DSP56001 mode size optimisations are on by default. Currently there is no
+   way to disable this behaviour.
+
  * In GPU/DSP code sections, you can use JUMP (Rx) in place of JUMP T, (Rx) and JR
-  (Rx) in place of JR T,(Rx).
+   (Rx) in place of JR T,(Rx).
 
  * RMAC tests all GPU/DSP restrictions and corrects them wherever possible (such as
-  inserting a NOP instruction when needed).
+   inserting a NOP instruction when needed).
 
  * The *(Rx+N)* addressing mode for GPU/DSP instructions is optimized to *(Rx)*
    when *N* is zero.