diff --git a/doc/jlatex/jgeometry.tex b/doc/jlatex/jgeometry.tex
index fce474e21..a253145c3 100644
--- a/doc/jlatex/jgeometry.tex
+++ b/doc/jlatex/jgeometry.tex
@@ -179,7 +179,7 @@ \subsection{種々の幾何学関数}
 このメソッドは、{\bf :intersection}よりも速い。なぜなら、新しい
 {\bf bounding-box}のインスタンスを作らないためである。}
 
-\methoddesc{:extreme-point}{direction}{
+\methoddesc{:extream-point}{direction}{
 この{\bf bounding-box}の８つの頂点の中で、{\em direction}との内積が最大のものを
 返す。}
 
diff --git a/doc/latex/geometry.tex b/doc/latex/geometry.tex
index 110ab8679..37116944b 100644
--- a/doc/latex/geometry.tex
+++ b/doc/latex/geometry.tex
@@ -194,7 +194,7 @@ \subsection{Miscellaneous Geometric Functions}
 This method is faster than {\bf :intersection} because no new instance
 of bounding-box is created.}
 
-\methoddesc{:extreme-point}{direction}{
+\methoddesc{:extream-point}{direction}{
 returns one of the eight corner points yielding the largest dot-product 
 with {\em direction}.}