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-rw-r--r--src/cairo.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/cairo.c b/src/cairo.c
index cefc9253..5f8d2661 100644
--- a/src/cairo.c
+++ b/src/cairo.c
@@ -816,7 +816,10 @@ cairo_get_source (cairo_t *cr)
* is less than @tolerance. The default value is 0.1. A larger
* value will give better performance, a smaller value, better
* appearance. (Reducing the value from the default value of 0.1
- * is unlikely to improve appearance significantly.)
+ * is unlikely to improve appearance significantly.) The accuracy of paths
+ * within Cairo is limited by the precision of its internal arithmetic, and
+ * the prescribed @tolerance is restricted to the smallest
+ * representable internal value.
**/
void
cairo_set_tolerance (cairo_t *cr, double tolerance)