diff --git a/physica-manual.pdf b/physica-manual.pdf
index 38a033e..805c481 100644
Binary files a/physica-manual.pdf and b/physica-manual.pdf differ
diff --git a/physica-manual.typ b/physica-manual.typ
index 5d40cef..13793da 100644
--- a/physica-manual.typ
+++ b/physica-manual.typ
@@ -539,6 +539,10 @@ Typst built-in math operators: #linkurl(`math.op`, "https://typst.app/docs/refer
   [#builtin([`log x, lg x, ln x`])],
   [$log x, lg x, ln x$],
   [logarithmic],
+  
+  [`lb x`],
+  [$lb x$],
+  [binary logarithm],
 
   [#builtin([`det A`])],
   [$det A$],
diff --git a/physica.typ b/physica.typ
index 59dec7e..70cc70a 100644
--- a/physica.typ
+++ b/physica.typ
@@ -538,7 +538,9 @@
 #let Re = math.op("Re")
 #let Im = math.op("Im")
 
-#let sgn = $op("sgn")$
+#let sgn = math.op("sgn")
+
+#let lb = math.op("lb")
 
 // == Differentials