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-rw-r--r--src/Rips_complex/utilities/README2
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diff --git a/src/Rips_complex/utilities/README b/src/Rips_complex/utilities/README
index c839a5f4..1a6f2b95 100644
--- a/src/Rips_complex/utilities/README
+++ b/src/Rips_complex/utilities/README
@@ -19,6 +19,8 @@ where `dim` is the dimension of the homological feature, `birth` and `death` are
* `-p [ --field-charac ]` (default = 11) Characteristic p of the coefficient field Z/pZ for computing homology.
* `-m [ --min-persistence ]` (default = 0) Minimal lifetime of homology feature to be recorded. Enter a negative value to see zero length intervals.
+Beware: this program may use a lot of RAM and take a lot of time if `max-edge-length` is set to a large value.
+
**Example 1 with Z/2Z coefficients**
`rips_persistence ../../data/points/tore3D_1307.off -r 0.25 -m 0.5 -d 3 -p 2`