diff --git a/README.md b/README.md
index 2259da2a8..9d6f13735 100644
--- a/README.md
+++ b/README.md
@@ -37,7 +37,8 @@ What does Prog8 provide?
 - small program boilerplate/compilersupport overhead
 - programs can be run multiple times without reloading because of automatic variable (re)initializations.
 - conditional branches
-- 'when' statement to provide a concise jump table alternative to if/elseif chains
+- ``when`` statement to provide a concise jump table alternative to if/elseif chains
+- ``in`` expression for concise and efficient multi-value/containment check 
 - many built-in functions such as ``sin``, ``cos``, ``rnd``, ``abs``, ``min``, ``max``, ``sqrt``, ``msb``, ``rol``, ``ror``, ``swap``, ``sort`` and ``reverse``
 - various powerful built-in libraries to do I/O, number conversions, graphics and more  
 - convenience abstractions for low level aspects such as ZeroPage handling, program startup, explicit memory addresses
diff --git a/docs/source/index.rst b/docs/source/index.rst
index 11b29bb70..0b6bbfbf6 100644
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -54,6 +54,9 @@ Language features
 - Subroutines with parameters and return values
 - Complex nested expressions are possible
 - Variables are allocated statically
+- Conditional branches to map directly on processor branch instructions
+- ``when`` statement to avoid if-else chains
+- ``in`` expression for concise and efficient multi-value/containment test
 - Nested subroutines can access variables from outer scopes to avoids the overhead to pass everything via parameters
 - Variable data types include signed and unsigned bytes and words, arrays, strings.
 - Floating point math also supported if the target system provides floating point library routines (C64 and Cx16 both do).