diff --git a/basis/simple-flat-file/summary.txt b/basis/simple-flat-file/summary.txt
new file mode 100644
index 0000000000..af4fd1feef
--- /dev/null
+++ b/basis/simple-flat-file/summary.txt
@@ -0,0 +1 @@
+Parsing simple text files
diff --git a/basis/simple-tokenizer/summary.txt b/basis/simple-tokenizer/summary.txt
new file mode 100644
index 0000000000..d9d2171265
--- /dev/null
+++ b/basis/simple-tokenizer/summary.txt
@@ -0,0 +1 @@
+Simple string tokenizer
diff --git a/core/hash-sets/summary.txt b/core/hash-sets/summary.txt
new file mode 100644
index 0000000000..ed38194407
--- /dev/null
+++ b/core/hash-sets/summary.txt
@@ -0,0 +1 @@
+Set structure with constant-time addition and removal