add section headings
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/docs/3.0-migration-guide.md b/docs/3.0-migration-guide.md
index b0903e3..bbb6d8e 100644
--- a/docs/3.0-migration-guide.md
+++ b/docs/3.0-migration-guide.md
@@ -15,6 +15,20 @@
- Changing function signatures (e.g., adding return codes or extra parameters); introducing const to arguments.
- Removal of functions marked as deprecated in 2.x
+## Low-level crypto
+
+## High-level crypto
+
+## PSA
+
+## The ALT interface
+
+## X.509
+
+## SSL
+
+## Tooling
+
### Introduce a level of indirection and versioning in the config files
`config.h` was split into `build_info.h` and `mbedtls_config.h`.
