Add documentation comments

Light documentation for our various functions and types.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/arg.rs b/src/arg.rs
index eaea67b..d1d62d9 100644
--- a/src/arg.rs
+++ b/src/arg.rs
@@ -1,6 +1,7 @@
 use regex::{self, Regex};
 
 
+/// Check if `s` is a numeric ID.
 pub fn is_suggestion_id(s: &str) -> Result<bool, regex::Error> {
     let re = Regex::new(r"^\d+$")?;