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diff --git a/docs/index.rst b/docs/index.rst
index f2f8dcfd..76580364 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -48,6 +48,7 @@ Features and limitations
 #) The deprecated Protocol Buffers feature called "groups" is not supported.
 #) Fields in the generated structs are ordered by the tag number, instead of the natural ordering in .proto file.
 #) Unknown fields are not preserved when decoding and re-encoding a message.
+#) Numeric arrays are always encoded as packed, even if not marked as packed in .proto. This causes incompatibility with decoders that do not support packed format.
 
 Getting started
 ===============
@@ -82,6 +83,12 @@ After that, buffer will contain the encoded message.
 The number of bytes in the message is stored in *stream.bytes_written*.
 You can feed the message to *protoc --decode=Example example.proto* to verify its validity.
 
+Debugging and testing
+=====================
+Extensive unittests are included under the *tests* folder. Just type *make* there to run the tests.
+
+This also generates a file called *breakpoints* which includes all lines returning *false* in nanopb. You can use this in gdb by typing *source breakpoints*, after which gdb will break on first nanopb error.
+
 Wishlist
 ========
 #) A specialized encoder for encoding to a memory buffer. Should serialize in reverse order to avoid having to determine submessage size beforehand.