diff --git a/aabb.cpp b/aabb.cpp
index 923f8309..d3f24d3b 100644
--- a/aabb.cpp
+++ b/aabb.cpp
@@ -61,7 +61,7 @@ AABB<S,T>::overlaps (point<S,T> p) const
 //-----------------------------------------------------------------------------
 template <size_t S, typename T>
 void
-AABB<S,T>::expand (point<S,T> p)
+AABB<S,T>::cover (point<S,T> p)
 {
     p0 = min (p, p0);
     p1 = max (p, p1);
diff --git a/aabb.hpp b/aabb.hpp
index 918d5498..3a3d56b3 100644
--- a/aabb.hpp
+++ b/aabb.hpp
@@ -37,7 +37,7 @@ namespace util {
 
         bool overlaps (point<S,T>) const;
 
-        void expand (point<S,T>);
+        void cover (point<S,T>);
 
         AABB<S,T> operator+ (vector<S,T>) const;
         AABB<S,T> operator- (vector<S,T>) const;