diff --git a/doc_src/cmds/math.rst b/doc_src/cmds/math.rst
index d6d466065..cb4041c08 100644
--- a/doc_src/cmds/math.rst
+++ b/doc_src/cmds/math.rst
@@ -87,6 +87,7 @@ Functions
 - ``floor`` - round number down to nearest integer
 - ``ln`` - the base-e logarithm
 - ``log`` or ``log10`` - the base-10 logarithm
+- ``log2`` - the base-2 logarithm
 - ``ncr`` - "from n choose r" combination function - how many subsets of size r can be taken from n (order doesn't matter)
 - ``npr`` - the number of subsets of size r that can be taken from a set of n elements (including different order)
 - ``pow(x,y)`` returns x to the y (and can be written as ``x ^ y``)
diff --git a/src/tinyexpr.cpp b/src/tinyexpr.cpp
index edff3c6c1..7ba06235d 100644
--- a/src/tinyexpr.cpp
+++ b/src/tinyexpr.cpp
@@ -202,6 +202,7 @@ static const te_builtin functions[] = {
     {L"ln", reinterpret_cast<const void *>(static_cast<te_fun1>(log)), TE_FUNCTION1},
     {L"log", reinterpret_cast<const void *>(static_cast<te_fun1>(log10)), TE_FUNCTION1},
     {L"log10", reinterpret_cast<const void *>(static_cast<te_fun1>(log10)), TE_FUNCTION1},
+    {L"log2", reinterpret_cast<const void *>(static_cast<te_fun1>(log2)), TE_FUNCTION1},
     {L"ncr", reinterpret_cast<const void *>(static_cast<te_fun2>(ncr)), TE_FUNCTION2},
     {L"npr", reinterpret_cast<const void *>(static_cast<te_fun2>(npr)), TE_FUNCTION2},
     {L"pi", reinterpret_cast<const void *>(static_cast<te_fun0>(pi)), TE_FUNCTION0},
diff --git a/tests/checks/math.fish b/tests/checks/math.fish
index 26746717f..2a410cbc6 100644
--- a/tests/checks/math.fish
+++ b/tests/checks/math.fish
@@ -186,3 +186,6 @@ math --base notabase
 # CHECKERR: math: 'notabase' is not a valid base value
 echo $status
 # CHECK: 2
+
+math 'log2(8)'
+# CHECK: 3