diff --git a/eth2/utils/ssz/src/encode.rs b/eth2/utils/ssz/src/encode.rs
index 5113fb71a..52b3d9bfd 100644
--- a/eth2/utils/ssz/src/encode.rs
+++ b/eth2/utils/ssz/src/encode.rs
@@ -27,6 +27,10 @@ pub trait Encode {
         BYTES_PER_LENGTH_OFFSET
     }
 
+    /// Returns the size (in bytes) when `self` is serialized.
+    ///
+    /// Returns the same value as `self.as_ssz_bytes().len()` but this method is significantly more
+    /// efficient.
     fn ssz_bytes_len(&self) -> usize;
 
     /// Returns the full-form encoding of this object.
diff --git a/lcli/src/pycli.rs b/lcli/src/pycli.rs
index 4b1b32828..dda61dd72 100644
--- a/lcli/src/pycli.rs
+++ b/lcli/src/pycli.rs
@@ -22,50 +22,6 @@ pub fn run_pycli<T: EthSpec>(matches: &ArgMatches) -> Result<(), String> {
     Ok(())
 }
 
-/*
- * TODO: loading from file.
- *
-use regex::Regex;
-use std::collections::HashMap;
-use std::ffi::OsString;
-
-const BLOCK_PREFIX: &str = "block_";
-const PRE_PREFIX: &str = "state_pre_";
-const POST_PREFIX: &str = "state_post_";
-
-struct Case<T: EthSpec> {
-    pre: Option<BeaconState<T>>,
-    post: Option<BeaconState<T>>,
-    block: Option<BeaconBlock<T>>,
-}
-
-fn get_sets<T: EthSpec>(dir: PathBuf) -> Result<(), String> {
-    let map: HashMap<String, Case<T>> = HashMap::new();
-
-    fs::read_dir(dir)
-        .map_err(|e| format!("Unable to read source directory: {:?}", e))?
-        .filter_map(Result::ok)
-        .map(|f| f.file_name().into_string())
-        .filter_map(Result::ok)
-        .try_for_each(|filename| {
-            if filename.starts_with(BLOCK_PREFIX) {
-                let regex = Regex::new(r".*root0x(.........)")
-                    .map_err(|e| format!("Failed to compile block regex: {:?}", e))?;
-                let captures = regex.captures(&filename).
-            // block
-            } else if filename.starts_with(PRE_PREFIX) {
-                dbg!("pre state");
-            } else if filename.starts_with(POST_PREFIX) {
-                dbg!("post state");
-            } else {
-                dbg!("unknown file");
-            }
-
-            Ok(())
-        })
-}
-*/
-
 /// A wrapper around Danny Ryan's `pycli` utility:
 ///
 /// https://github.com/djrtwo/pycli
diff --git a/lcli/src/transition_blocks.rs b/lcli/src/transition_blocks.rs
index d8b0974b4..01e639db8 100644
--- a/lcli/src/transition_blocks.rs
+++ b/lcli/src/transition_blocks.rs
@@ -41,13 +41,6 @@ pub fn run_transition_blocks(matches: &ArgMatches) -> Result<(), String> {
         .write_all(&post_state.as_ssz_bytes())
         .map_err(|e| format!("Unable to write to output file: {:?}", e))?;
 
-    /*
-    println!(
-        "{}",
-        serde_yaml::to_string(&post_state).expect("Should serialize state")
-    );
-    */
-
     Ok(())
 }