diff --git a/Cargo.toml b/Cargo.toml
index 2b921a4e6..8b7504d6f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,3 +23,15 @@ features = [ "v3_10", "v3_12", "v3_22" ]
 [dependencies.gdk]
 git = "https://github.com/gtk-rs/gdk.git"
 features = [ "v3_10", "v3_12", "v3_22" ]
+
+[profile.dev]
+opt-level = 2      # controls the `--opt-level` the compiler builds with
+debug = true       # controls whether the compiler passes `-C debuginfo`
+                   # a value of `true` is equivalent to `2`
+rpath = false      # controls whether the compiler passes `-C rpath`
+lto = false        # controls `-C lto` for binaries and staticlibs
+debug-assertions = true # controls whether debug assertions are enabled
+codegen-units = 1  # controls whether the compiler passes `-C codegen-units`
+                   # `codegen-units` is ignored when `lto = true`
+panic = 'unwind'   # panic strategy (`-C panic=...`), can also be 'abort'
+
diff --git a/src/app_state.rs b/src/app_state.rs
index 268461a23..e3b116b74 100644
--- a/src/app_state.rs
+++ b/src/app_state.rs
@@ -2,6 +2,7 @@ use gtk;
 
 
 
+// TODO: glade stuff, config, alsacard
 pub struct AppS {
     /* we keep this to ensure the lifetime is across the whole application */
     pub status_icon: gtk::StatusIcon,
diff --git a/src/audio.rs b/src/audio.rs
index fc773365d..d6b010186 100644
--- a/src/audio.rs
+++ b/src/audio.rs
@@ -178,6 +178,8 @@ extern fn watch_cb(
         return true as glib_sys::gboolean;
     }
 
+    // TODO: handle alsa events, pass to 'on_alsa_event'
+
     return true as glib_sys::gboolean;
 }
 
diff --git a/src/errors.rs b/src/errors.rs
index 1fc76ee9d..1f43e62a4 100644
--- a/src/errors.rs
+++ b/src/errors.rs
@@ -2,6 +2,8 @@ use alsa;
 use std::convert::From;
 use std;
 
+
+
 error_chain! {
     foreign_links {
         Alsa(alsa::Error);
@@ -9,11 +11,13 @@ error_chain! {
 
 }
 
+
 pub trait CHErr {
     type Item;
     fn cherr(self) -> Result<Self::Item>;
 }
 
+
 impl<A, E: std::error::Error> CHErr for std::result::Result<A, E>
     where Error: std::convert::From<E>
 {
@@ -37,6 +41,7 @@ macro_rules! try_w {
     }
 }
 
+
 #[macro_export]
 macro_rules! try_wr {
     ($expr:expr, $ret:expr) => (match $expr {
@@ -64,6 +69,7 @@ macro_rules! try_wr {
     })
 }
 
+
 #[macro_export]
 macro_rules! try_r {
     ($expr:expr, $ret:expr) => (match $expr {
@@ -73,3 +79,4 @@ macro_rules! try_r {
         },
     });
 }
+