Index: gcc/cfgloop.c
===================================================================
--- gcc/cfgloop.c	(revision 173677)
+++ gcc/cfgloop.c	(working copy)
@@ -368,6 +368,11 @@ init_loops_structure (struct loops *loops, unsigne
 
 /* Find all the natural loops in the function and save in LOOPS structure and
    recalculate loop_depth information in basic block structures.
+
+   This function calls calculate_dominance_info which allocates a structure to
+   handle dominance. It must be freed after use with the function
+   free_dominance_info.
+
    Return the number of natural loops found.  */
 
 int