diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,9 @@
 
 # Changelog by versions
 
+## From 3.22.2.0 to 3.22.3.0
+* Add more math symbols. (leftaroundabout)
+
 ## From 3.22.1.0 to 3.22.2.0
 * New render method: renderBuilder.
 
diff --git a/HaTeX.cabal b/HaTeX.cabal
--- a/HaTeX.cabal
+++ b/HaTeX.cabal
@@ -1,5 +1,5 @@
 Name: HaTeX
-Version: 3.22.2.0
+Version: 3.22.3.0
 Author: Daniel Díaz
 Category: LaTeX
 Build-type: Simple
@@ -27,9 +27,6 @@
              Browse the @examples@ directory in the source distribution to see some simple examples.
              It might help you to get started. The HaTeX User's Guide is available at
              <https://github.com/Daniel-Diaz/hatex-guide/blob/master/README.md>.
-             We also have a mailing list (<http://projects.haskell.org/cgi-bin/mailman/listinfo/hatex>)
-             and an IRC channel (@#hatex@). If you just want to read a short introduction, read
-             the "Text.LaTeX" module.
              .
              If you prefer to write in LaTeX and all you want is to /program/ some parts of the document,
              or if you already have the LaTeX document written and you just want to add some automatically
diff --git a/Text/LaTeX/Base/Math.hs b/Text/LaTeX/Base/Math.hs
--- a/Text/LaTeX/Base/Math.hs
+++ b/Text/LaTeX/Base/Math.hs
@@ -20,8 +20,6 @@
    -- ** Referencing
  , nonumber
    -- * Symbols and utilities
-   -- | The unicode approximations do, of course, not reliably represent how
-   --   LaTeX renders these symbols.
    
    -- ** Brackets / delimiters
  , autoParens
@@ -72,15 +70,18 @@
  , propto
  , parallel
  , perp
+ , approx
+ , sim, simeq
+ , cong
    -- *** Sets
  , in_ , ni , notin
- , subset , supset
+ , subset , supset, subseteq, supseteq
  , cap , cup
  , setminus
    -- *** Misc operators
  , vee , wedge
  , oplus , ominus , otimes
- , oslash , odot
+ , oslash , odot , uplus
    -- *** Accents
  , hat, tilde, bar, vec, widehat, widetilde
  , dot
@@ -616,6 +617,23 @@
 perp :: LaTeXC l => l -> l -> l
 perp = between $ comm0 "perp"
 
+-- | Approximate equality \(\approx\)
+approx :: LaTeXC l => l -> l -> l
+approx = between $ comm0 "approx"
+
+-- | Generic equivalence relation \(\sim\).
+sim :: LaTeXC l => l -> l -> l
+sim = between $ comm0 "sim"
+
+-- | Equivalence relation \(\simeq\). Sometimes used for approximate
+--   equality or isomorphism.
+simeq :: LaTeXC l => l -> l -> l
+simeq = between $ comm0 "simeq"
+
+-- | Congruence \(\cong\).
+cong :: LaTeXC l => l -> l -> l
+cong = between $ comm0 "cong"
+
 -- | Parallel \(\parallel\).
 parallel :: LaTeXC l => l -> l -> l
 parallel = between $ comm0 "parallel"
@@ -640,10 +658,18 @@
 subset :: LaTeXC l => l -> l -> l
 subset  = between $ comm0 "subset"
 
--- | Superset-of \(supset\).
+-- | Subset-of-or-equal \(\subseteq\).
+subseteq :: LaTeXC l => l -> l -> l
+subseteq  = between $ comm0 "subseteq"
+
+-- | Superset-of \(\supset\).
 supset :: LaTeXC l => l -> l -> l
 supset  = between $ comm0 "supset"
 
+-- | Superset-of-or-equal \(\supseteq\).
+supseteq :: LaTeXC l => l -> l -> l
+supseteq  = between $ comm0 "supseteq"
+
 -- | Set intersection \(\cap\).
 cap :: LaTeXC l => l -> l -> l
 cap  = between $ comm0 "cap"
@@ -683,6 +709,10 @@
 -- | Circled dot operator \(\odot\).
 odot :: LaTeXC l => l -> l -> l
 odot  = between $ comm0 "odot"
+
+-- | Disjoint sum operator \(\uplus\).
+uplus :: LaTeXC l => l -> l -> l
+uplus  = between $ comm0 "uplus"
 
 --- Accemts
 {-
diff --git a/Text/LaTeX/Packages/AMSMath.hs b/Text/LaTeX/Packages/AMSMath.hs
--- a/Text/LaTeX/Packages/AMSMath.hs
+++ b/Text/LaTeX/Packages/AMSMath.hs
@@ -24,8 +24,6 @@
    -- ** Referencing
  , eqref , nonumber
    -- * Symbols and utilities
-   -- | The unicode approximations do, of course, not reliably represent how
-   --   LaTeX renders these symbols.
    
    -- ** Brackets / delimiters
  , autoParens
@@ -76,9 +74,14 @@
  , propto
  , parallel
  , perp
+ , approx
+ , sim
+ , simeq
+ , cong
    -- *** Sets
  , in_ , ni , notin
  , subset , supset
+ , subseteq , supseteq
  , cap , cup
  , setminus
    -- *** Misc operators