diff --git a/.emacs.d/include/latexconfig.el b/.emacs.d/include/latexconfig.el
index 4622e1e..ed558bd 100644
--- a/.emacs.d/include/latexconfig.el
+++ b/.emacs.d/include/latexconfig.el
@@ -54,17 +54,18 @@
 (add-hook 'LaTeX-mode-hook #'configure-latex)
 
 (setq cdlatex-math-symbol-alist
-      '((?I ("\\int"        "\\Im"))
-        (?L ("\\Lambda"     "\\lim"))
-        (?S ("\\Sigma"      "\\sum"))
-        (?0 ("\\varnothing" "\\emptyset"))
-        (?- ("\\not"        "\\neg"))
-        (?+ ("\\cup"        "\\cap"))
-        (?/ ("\\frac"))
-        (?{ ("\\subset"     "\\subseteq"))
-        (?} ("\\supset"     "\\supseteq"))
-        (?. ("\\cdot"       "\\cdots"    "\\ldots"))
-        (?# ("\\mathbb"     "\\mathcal"))))
+      '((?I ("\\int"            "\\Im"))
+        (?L ("\\Lambda"         "\\lim"))
+        (?S ("\\Sigma"          "\\sum"))
+        (?m ("\\mu"             "\\mod"))
+        (?0 ("\\varnothing"     "\\emptyset"))
+        (?- ("\\not"            "\\neg"))
+        (?+ ("\\cup"            "\\cap"))
+        (?{ ("\\subset"         "\\subseteq"))
+        (?} ("\\supset"         "\\supseteq"))
+        (?. ("\\cdot"           "\\cdots"              "\\ldots"))
+        (?# ("\\mathbb"         "\\mathcal"))
+        (?= ("\\Leftrightarrow" "\\Longleftrightarrow" "\\cong"))))
 
 (setq cdlatex-math-modify-alist
       '((?b "\\mathbb"  "\\textbf" t nil nil)