diff --git a/src/lib.rs b/src/lib.rs
index 4c1c46f..7f305f6 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -12,6 +12,12 @@
 // You should have received a copy of the GNU General Public License along with
 // insta-image. If not, see <https://www.gnu.org/licenses/>.
 
+//! `insta-image` provides macros for making assertions against image snapshots
+//! with [insta](https://insta.rs).
+//!
+//! Image formats are feature-guarded. See their respective submodules for
+//! further documentation.
+
 #[cfg(feature = "png")]
 mod png;
 
diff --git a/src/compressed_16bpc_rgb.png b/src/png/compressed_16bpc_rgb.png
similarity index 100%
rename from src/compressed_16bpc_rgb.png
rename to src/png/compressed_16bpc_rgb.png
diff --git a/src/compressed_16bpc_rgb_interlaced.png b/src/png/compressed_16bpc_rgb_interlaced.png
similarity index 100%
rename from src/compressed_16bpc_rgb_interlaced.png
rename to src/png/compressed_16bpc_rgb_interlaced.png
diff --git a/src/compressed_16bpc_rgba.png b/src/png/compressed_16bpc_rgba.png
similarity index 100%
rename from src/compressed_16bpc_rgba.png
rename to src/png/compressed_16bpc_rgba.png
diff --git a/src/compressed_8bpc_rgb.png b/src/png/compressed_8bpc_rgb.png
similarity index 100%
rename from src/compressed_8bpc_rgb.png
rename to src/png/compressed_8bpc_rgb.png
diff --git a/src/png.rs b/src/png/mod.rs
similarity index 100%
rename from src/png.rs
rename to src/png/mod.rs
diff --git a/src/uncompressed_16bpc_rgb.png b/src/png/uncompressed_16bpc_rgb.png
similarity index 100%
rename from src/uncompressed_16bpc_rgb.png
rename to src/png/uncompressed_16bpc_rgb.png