diff --git a/crates/proc-macro-srv/src/server/rust_analyzer_span.rs b/crates/proc-macro-srv/src/server/rust_analyzer_span.rs
index 4a2ad40ad9..f52a4875b0 100644
--- a/crates/proc-macro-srv/src/server/rust_analyzer_span.rs
+++ b/crates/proc-macro-srv/src/server/rust_analyzer_span.rs
@@ -76,6 +76,7 @@ impl server::FreeFunctions for RaSpanServer {
 
         let kind = literal_to_external(literal.kind()).ok_or(Err(()))?;
 
+        // FIXME: handle more than just int and float suffixes
         let suffix = match literal.kind() {
             ast::LiteralKind::FloatNumber(num) | ast::LiteralKind::IntNumber(num) => num.suffix(),
             _ => None,
diff --git a/crates/proc-macro-srv/src/server/token_id.rs b/crates/proc-macro-srv/src/server/token_id.rs
index 4dbda7e53c..d5f7359255 100644
--- a/crates/proc-macro-srv/src/server/token_id.rs
+++ b/crates/proc-macro-srv/src/server/token_id.rs
@@ -67,6 +67,7 @@ impl server::FreeFunctions for TokenIdServer {
 
         let kind = literal_to_external(literal.kind()).ok_or(Err(()))?;
 
+        // FIXME: handle more than just int and float suffixes
         let suffix = match literal.kind() {
             ast::LiteralKind::FloatNumber(num) | ast::LiteralKind::IntNumber(num) => num.suffix(),
             _ => None,