diff --git a/include/ChangeLog b/include/ChangeLog
index 861aefc08ff..058e782ea5e 100644
--- a/include/ChangeLog
+++ b/include/ChangeLog
@@ -1,3 +1,7 @@
+2003-02-27  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
+
+	* libiberty.h: Document return value of physmem routines.
+
 2003-02-20  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
 	* libiberty.h (physmem_total, physmem_available): Prototype.
diff --git a/include/libiberty.h b/include/libiberty.h
index dca120efaea..676ceaba4a9 100644
--- a/include/libiberty.h
+++ b/include/libiberty.h
@@ -246,7 +246,7 @@ extern char *xstrdup PARAMS ((const char *)) ATTRIBUTE_MALLOC;
 
 extern PTR xmemdup PARAMS ((const PTR, size_t, size_t)) ATTRIBUTE_MALLOC;
 
-/* Physical memory routines.  */
+/* Physical memory routines.  Return values are in BYTES.  */
 extern double physmem_total PARAMS ((void));
 extern double physmem_available PARAMS ((void));