diff --git a/csvq/README.md b/csvq/README.md
new file mode 100644
index 000000000..e5bec36cb
--- /dev/null
+++ b/csvq/README.md
@@ -0,0 +1 @@
+This tool loads the whole file in memory, which means it cannot run even a single query from ClickBench.
diff --git a/dsq/README.md b/dsq/README.md
new file mode 100644
index 000000000..ee98195c8
--- /dev/null
+++ b/dsq/README.md
@@ -0,0 +1,7 @@
+The tool looks non-functional.
+
+Even the simplest query:
+```
+dsq hits.parquet "SELECT count(*) FROM {}"
+```
+leads to OOM.