--- a/doc/interpreter/octave.texi
+++ b/doc/interpreter/octave.texi
@@ -40,7 +40,7 @@
 
 @defindex op
 
-@c Things like the Octave version number are defined in conf.texi.
+@c Things like the Octave version number are defined in conf.txi.
 @c This file doesn't include a chapter, so it must not be included
 @c if you want to run the Emacs function texinfo-multiple-files-update.
 
@@ -146,6 +146,7 @@
 * Signal Processing::           
 * Image Processing::            
 * Audio Processing::            
+* Quaternions::                 
 * System Utilities::            
 * Tips::                        
 * Trouble::                     If you have trouble installing Octave.
@@ -164,316 +165,6 @@
 
 Preface
 
-* Acknowledgements::            
-* How You Can Contribute to Octave::  
-* Distribution::                
-
-A Brief Introduction to Octave
-
-* Running Octave::              
-* Simple Examples::             
-* Conventions::                 
-
-Conventions
-
-* Fonts::                       
-* Evaluation Notation::         
-* Printing Notation::           
-* Error Messages::              
-* Format of Descriptions::      
-
-Format of Descriptions
-
-* A Sample Function Description::  
-* A Sample Command Description::  
-* A Sample Variable Description::  
-
-Getting Started
-
-* Invoking Octave::             
-* Quitting Octave::             
-* Getting Help::                
-* Command Line Editing::        
-* Errors::                      
-* Executable Octave Programs::  
-* Comments::                    
-
-Invoking Octave
-
-* Command Line Options::        
-* Startup Files::               
-
-Command Line Editing
-
-* Cursor Motion::               
-* Killing and Yanking::         
-* Commands For Text::           
-* Commands For Completion::     
-* Commands For History::        
-* Customizing readline::        
-* Customizing the Prompt::      
-* Diary and Echo Commands::     
-
-Data Types
-
-* Built-in Data Types::         
-* User-defined Data Types::     
-* Object Sizes::                
-
-Built-in Data Types
-
-* Numeric Objects::             
-* String Objects::              
-* Data Structure Objects::      
-
-Numeric Data Types
-
-* Matrices::                    
-* Ranges::                      
-* Logical Values::              
-* Predicates for Numeric Objects::  
-
-Matrices
-
-* Empty Matrices::              
-
-Strings
-
-* Creating Strings::            
-* Searching and Replacing::     
-* String Conversions::          
-* Character Class Functions::   
-
-Containers
-
-* Lists::                       
-* Cell Arrays::                 
-
-Variables
-
-* Global Variables::            
-* Status of Variables::         
-* Summary of Built-in Variables::  
-* Defaults from the Environment::  
-
-Expressions
-
-* Index Expressions::           
-* Calling Functions::           
-* Arithmetic Ops::              
-* Comparison Ops::              
-* Boolean Expressions::         
-* Assignment Ops::              
-* Increment Ops::               
-* Operator Precedence::         
-
-Calling Functions
-
-* Call by Value::               
-* Recursion::                   
-
-Boolean Expressions
-
-* Element-by-element Boolean Operators::  
-* Short-circuit Boolean Operators::  
-
-Statements
-
-* The if Statement::            
-* The switch Statement::        
-* The while Statement::         
-* The for Statement::           
-* The break Statement::         
-* The continue Statement::      
-* The unwind_protect Statement::  
-* The try Statement::           
-* Continuation Lines::          
-
-The @code{for} Statement
-
-* Looping Over Structure Elements::  
-
-Functions and Script Files
-
-* Defining Functions::          
-* Multiple Return Values::      
-* Variable-length Argument Lists::  
-* Variable-length Return Lists::  
-* Returning From a Function::   
-* Function Files::              
-* Script Files::                
-* Dynamically Linked Functions::  
-* Organization of Functions::   
-
-Input and Output
-
-* Basic Input and Output::      
-* C-Style I/O Functions::       
-
-Basic Input and Output
-
-* Terminal Output::             
-* Terminal Input::              
-* Simple File I/O::             
-
-C-Style I/O Functions
-
-* Opening and Closing Files::   
-* Simple Output::               
-* Line-Oriented Input::         
-* Formatted Output::            
-* Output Conversion for Matrices::  
-* Output Conversion Syntax::    
-* Table of Output Conversions::  
-* Integer Conversions::         
-* Floating-Point Conversions::  Other Output Conversions::    
-* Other Output Conversions::    
-* Formatted Input::             
-* Input Conversion Syntax::     
-* Table of Input Conversions::  
-* Numeric Input Conversions::   
-* String Input Conversions::    
-* Binary I/O::                  
-* Temporary Files::             
-* EOF and Errors::              
-* File Positioning::            
-
-Plotting
-
-* Two-Dimensional Plotting::    
-* Specialized Two-Dimensional Plots::  
-* Three-Dimensional Plotting::  
-* Plot Annotations::            
-* Multiple Plots on One Page::  
-* Multiple Plot Windows::       
-* Interaction with gnuplot::    
-
-Matrix Manipulation
-
-* Finding Elements and Checking Conditions::  
-* Rearranging Matrices::        
-* Special Utility Matrices::    
-* Famous Matrices::             
-
-Arithmetic
-
-* Utility Functions::           
-* Complex Arithmetic::          
-* Trigonometry::                
-* Sums and Products::           
-* Special Functions::           
-* Mathematical Constants::      
-
-Linear Algebra
-
-* Basic Matrix Functions::      
-* Matrix Factorizations::       
-* Functions of a Matrix::       
-
-Quadrature
-
-* Functions of One Variable::   
-* Orthogonal Collocation::      
-
-Differential Equations
-
-* Ordinary Differential Equations::  
-* Differential-Algebraic Equations::  
-
-Optimization
-
-* Quadratic Programming::       
-* Nonlinear Programming::       
-* Linear Least Squares::        
-
-Control Theory
-
-* sysstruct::                   
-* sysinterface::                
-* sysdisp::                     
-* blockdiag::                   
-* numerical::                   
-* sysprop::                     
-* systime::                     
-* sysfreq::                     
-* cacsd::                       
-* misc::                        
-
-System Data Structure
-
-* sysstructvars::               
-* sysstructtf::                 
-* sysstructzp::                 
-* sysstructss::                 
-
-System Construction and Interface Functions
-
-* fir2sys::                     
-* ss2sys::                      
-* tf2sys::                      
-* zp2sys::                      
-* structaccess::                
-* structintern::                
-
-System Utilities
-
-* Timing Utilities::            
-* Filesystem Utilities::        
-* Controlling Subprocesses::    
-* Process ID Information::      
-* Environment Variables::       
-* Current Working Directory::   
-* Password Database Functions::  
-* Group Database Functions::    
-* System Information::          
-
-Tips and Standards
-
-* Style Tips::                  Writing clean and robust programs.
-* Coding Tips::                 Making code run faster.
-* Documentation Tips::          Writing readable documentation strings.
-* Comment Tips::                Conventions for writing comments.
-* Function Headers::            Standard headers for functions.
-
-Known Causes of Trouble with Octave
-
-* Actual Bugs::                 Bugs we will fix later.
-* Reporting Bugs::              
-* Bug Criteria::                
-* Bug Lists::                   
-* Bug Reporting::               
-* Sending Patches::             
-* Service::                     
-
-Reporting Bugs
-
-* Bug Criteria::                
-* Where: Bug Lists.             Where to send your bug report.
-* Reporting: Bug Reporting.     How to report a bug effectively.
-* Patches: Sending Patches.     How to send a patch for Octave.
-
-Installing Octave
-
-* Installation Problems::       
-* Binary Distributions::        
-
-Binary Distributions
-
-* Installing Octave from a Binary Distribution::  
-* Creating a Binary Distribution::  
-
-Emacs Octave Support
-
-* Installing EOS::              
-* Using Octave Mode::           
-* Running Octave From Within Emacs::  
-* Using the Emacs Info Reader for Octave::  
-
-Grammar
-
-* Keywords::                    
-
-@end detailmenu
 @end menu
 
 @include preface.texi
@@ -508,6 +199,7 @@
 @include signal.texi
 @include image.texi
 @include audio.texi
+@include quaternion.texi
 @include system.texi
 
 @c maybe add again later, if anyone every writes any really interesting