README: update

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--- a/README.md
+++ b/README.md
@@ -30,6 +30,36 @@ After building, you can run the "test suite" (depends on Pytest).
 
     make test
 
+### Code coverage
+
+You can generate a code coverage report (depends on `gcovr`) in
+build/coverage/:
+
+    make coverage
+
+The latest code coverage report for the `master` branch can be found at
+https://egor-tensin.github.io/cimple/coverage/.
+
+### Flame graphs
+
+Some performance analysis can be done by looking at flame graphs.
+Generate them after building the project (depends on `perf` & [FlameGraph]):
+
+    make test/perf
+
+[FlameGraph]: https://github.com/brendangregg/FlameGraph
+
+This will generate two flame graphs in build/flame_graphs/; they stress
+slightly different parts of the system:
+
+* [flame_graph_output_simple.svg] for a CI script with short output,
+* [flame_graph_output_long.svg] for a CI script with long output.
+
+[flame_graph_output_simple.svg]: https://egor-tensin.github.io/cimple/flame_graphs/flame_graph_output_simple.svg
+[flame_graph_output_long.svg]: https://egor-tensin.github.io/cimple/flame_graphs/flame_graph_output_long.svg
+
+Follow the links above to view the latest flame graphs for the `master` branch.
+
 ### Code style
 
 Set up the git pre-commit hook by running `./scripts/setup-hooks.sh`.