diff --git a/katex-convert-unicode.rkt b/katex-convert-unicode.rkt
index 2862e263a..4b7630731 100644
--- a/katex-convert-unicode.rkt
+++ b/katex-convert-unicode.rkt
@@ -112,6 +112,9 @@
       [⋀ "\\bigwedge{}"]
       [⋁ "\\bigvee{}"]
       [± "\\pm{}"]
+      [≟ "\\stackrel{?}{=}"]
+      [≛ "\\stackrel{*}{=}"]
+      [≝ "\\stackrel{\\scriptscriptstyle\\mathsf{def}}{=}"]
       ))
   (if (string? str)
       (string-replace*
diff --git a/mathjax-convert-unicode.rkt b/mathjax-convert-unicode.rkt
index 335b04de1..9bf854902 100644
--- a/mathjax-convert-unicode.rkt
+++ b/mathjax-convert-unicode.rkt
@@ -17,5 +17,6 @@
       ;; TODO:
       [❲ "\\ifmathjax{\\unicode{x2772}}\\iflatex{❲}"]
       [❳ "\\ifmathjax{\\unicode{x2773}}\\iflatex{❳}"]
+      [φ "\\phi"]
       ))
   (katex-convert-unicode str* mathmode? more-sym→*))
\ No newline at end of file