diff --git a/Doxyfile.in b/Doxyfile.in
index 1efa4dabc..ed84ace5a 100644
--- a/Doxyfile.in
+++ b/Doxyfile.in
@@ -1,4 +1,4 @@
-# Doxyfile 1.8.11
+# Doxyfile 1.8.13
 
 # This file describes the settings to be used by the documentation system
 # doxygen (www.doxygen.org) for a project.
@@ -228,10 +228,9 @@ TAB_SIZE               = 4
 # "Side Effects:". You can put \n's in the value part of an alias to insert
 # newlines.
 
-ALIASES                =
-ALIASES               += ai{1}="@ref ai::\1 \"\1\""
-ALIASES               += movement{1}="@ref ai::movement::\1 \"\1\""
-ALIASES               += debug{1}="@ref ai::debug::\1 \"\1\""
+ALIASES                = "ai{1}=@ref ai::\1 \"\1\"" \
+                         "movement{1}=@ref ai::movement::\1 \"\1\"" \
+                         "debug{1}=@ref ai::debug::\1 \"\1\""
 
 # This tag can be used to specify a number of word-keyword mappings (TCL only).
 # A mapping has the form "name=value". For example adding "class=itcl::class"
@@ -296,6 +295,15 @@ EXTENSION_MAPPING      =
 
 MARKDOWN_SUPPORT       = YES
 
+# When the TOC_INCLUDE_HEADINGS tag is set to a non-zero value, all headings up
+# to that level are automatically included in the table of contents, even if
+# they do not have an id attribute.
+# Note: This feature currently applies only to Markdown headings.
+# Minimum value: 0, maximum value: 99, default value: 0.
+# This tag requires that the tag MARKDOWN_SUPPORT is set to YES.
+
+TOC_INCLUDE_HEADINGS   = 0
+
 # When enabled doxygen tries to link words that correspond to documented
 # classes, or namespaces to their corresponding documentation. Such a link can
 # be prevented in individual cases by putting a % sign in front of the word or
@@ -774,7 +782,8 @@ WARN_LOGFILE           =
 # spaces. See also FILE_PATTERNS and EXTENSION_MAPPING
 # Note: If this tag is empty the current directory is searched.
 
-INPUT                  = @CMAKE_CURRENT_SOURCE_DIR@/src/ @GENERATE_DIR@
+INPUT                  = @CMAKE_CURRENT_SOURCE_DIR@/src/ \
+                         @GENERATE_DIR@
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses
@@ -796,8 +805,8 @@ INPUT_ENCODING         = UTF-8
 # If left blank the following patterns are tested:*.c, *.cc, *.cxx, *.cpp,
 # *.c++, *.java, *.ii, *.ixx, *.ipp, *.i++, *.inl, *.idl, *.ddl, *.odl, *.h,
 # *.hh, *.hxx, *.hpp, *.h++, *.cs, *.d, *.php, *.php4, *.php5, *.phtml, *.inc,
-# *.m, *.markdown, *.md, *.mm, *.dox, *.py, *.pyw, *.f90, *.f, *.for, *.tcl,
-# *.vhd, *.vhdl, *.ucf, *.qsf, *.as and *.js.
+# *.m, *.markdown, *.md, *.mm, *.dox, *.py, *.pyw, *.f90, *.f95, *.f03, *.f08,
+# *.f, *.for, *.tcl, *.vhd, *.vhdl, *.ucf and *.qsf.
 
 FILE_PATTERNS          =
 
@@ -2364,6 +2373,11 @@ DIAFILE_DIRS           =
 
 PLANTUML_JAR_PATH      =
 
+# When using plantuml, the PLANTUML_CFG_FILE tag can be used to specify a
+# configuration file for plantuml.
+
+PLANTUML_CFG_FILE      =
+
 # When using plantuml, the specified paths are searched for files specified by
 # the !include statement in a plantuml block.