Add "./build-{example,fuzz}.sh" instructions
diff --git a/example/README.md b/example/README.md
index 6758b8b..7337775 100644
--- a/example/README.md
+++ b/example/README.md
@@ -1,3 +1,5 @@
+# Wuffs' Example Programs
+
This directory contains example programs that use [Wuffs the
Library](/doc/wuffs-the-library.md). See [Hello `wuffs-c`](/hello-wuffs-c) for
an example program that uses [Wuffs the Language](/doc/wuffs-the-language.md)
@@ -8,3 +10,17 @@
level of triviality. For example, the [example/crc32](/example/crc32/crc32.cc)
and [example/zcat](/example/zcat/zcat.c) programs are roughly equivalent to
Debian Linux's `/usr/bin/crc32` and `/bin/zcat` programs.
+
+
+## Building
+
+Running `build-example.sh` from the top level directory will build all of the
+examples. To check out and build just one, such as `jsonptr`:
+
+ git clone https://github.com/google/wuffs.git
+ cd wuffs
+ ./build-example.sh example/jsonptr
+
+When re-building, you only need the last of those three lines. To run it:
+
+ gen/bin/example-jsonptr test/data/json-things.unformatted.json
diff --git a/fuzz/c/std/README.md b/fuzz/c/std/README.md
index b179172..e75bcbf 100644
--- a/fuzz/c/std/README.md
+++ b/fuzz/c/std/README.md
@@ -1,3 +1,5 @@
+# Wuffs' Fuzzer Programs
+
This directory contains multiple programs to fuzz Wuffs' implementations of
various codecs. For example, `gif_fuzzer.c` is a program to fuzz Wuffs' GIF
implementation.
@@ -11,3 +13,17 @@
test suite, in order to speed up the edit-compile-run cycle. Look for
`WUFFS_CONFIG__FUZZLIB_MAIN` for more details, and in `seed_corpora.txt` for
suggested test data.
+
+
+## Building
+
+Running `build-fuzz.sh` from the top level directory will build all of the
+fuzzers. To check out and build just one, such as `json_fuzzer`:
+
+ git clone https://github.com/google/wuffs.git
+ cd wuffs
+ ./build-fuzz.sh fuzz/c/std/json_fuzzer.cc
+
+When re-building, you only need the last of those three lines. To run it:
+
+ gen/bin/fuzz-json test/data/json-things.*
